To many web-building spiders, most of whom are nearly blind, the web is their e
题型：不详难度：来源：
starve to death.
So important is the web to an orb-web spider"s survival that the animal will continue to construct new webs daily even if it is being starved. For 16 days the starving spider builds completely normal webs. Then, as the animal gets scrawnier（憔悴的）， it constructs a wider-meshed web using fewer strands（线）. Such webs would only trap larger prey, which is more economical from the perspective of a starving spider.
The spider stores energy by recycling web protein. It simply eats its own web each evening and reuses it to produce new silk. In studies with radioactively，labeled materials, it was found that 95 percent of web protein reappears in the next day" web. Most of the energy needed for web-building is used in walking over the strands as they are laid down．
Scientists are impressed by the adaptability of the spider"s highly preprogrammed brain, which is larger for its size than the brain of any other invertebrate（无脊推动物）．If web-building is interrupted, or if some of the existing strands are destroyed，the spider simply goes back to see where the web is left off and then finishes building a normal web. One spider will finish building the incomplete web of another.
小题1: Which of the following best expresses the main ideas of the passage?
| A．Secrets of Spiders" Adaptability | B．Importance of Webs to Spiders |
| C．Secrets of the Spiders" Life | D．Spiders" Highly Preprogrammed Brain |
| A．Most spiders will stop conducting webs when hungry. |
| B．One Web-building spider usually conducts one web. |
| C．Web-building spiders will probably die without their webs． |
| D．Web-building spiders have good eyesight. |
| A．it is 16 days old | B．it is getting weaker |
| C．it has fewer wends | D．it hunts for food |
| A．it has a highly preprogrammed brain | B．it reuses its web protein to reproduce new silk |
| C．the web is everything for a spider | D．it is able to rebuild a destroyed web |
答案
小题1:B
小题2:C
小题3:B
小题4:A
解析
小题1:从文章第一段以及第二段句首可知B项最佳。
小题2:从第一段可知。
小题3:从第二段第三句可知。
小题4:文章最后一段第一句为主题句，所以蜘蛛织完未完的网是它的本能，因为它有一颗有较高预排程序的大脑来适应环境。
举一反三
As populations increase across Australia and the rest of the world, demand for water will also increase. If we don’t reduce each individual’s demand for water (both directly and through embodied water) the water situation will become dire.
It is obvious that we cannot increase demands for water much more without detrimental(有害的) effects to the environment, society and the economy.
It’s all too easy to blame someone else for the water situation –“if 70% of water is used for agriculture then that’s what we should target” – but it’s not that easy. We all depend on the food and resources that agriculture provides, and while there are definitely opportunities to increase water efficiency on the farm, the solution will take more than that.
We each share responsibility for the sustainable management of our water resources, which means using less water at home, in the workplace, at school, on holidays, on the farm, … everyone, everywhere, every time.
It"s time to become water efficient! This involves reassessing our relationship with water, and learning to use it more sparingly. On the most basic level, it requires a behavioural（行动的） change, and assigning a value to water that truly reflects its worth.
We can also unlock economic benefits of being water efficient. There are many real world examples given in the case studies on this site.
Everybody has a responsibility to save water, if future generations are to enjoy a similar standard of living to the one we enjoy now. In fact, many of the impacts associated with water use are likely to have an effect on our own lives!
www.savewater.com.au has been designed to help you respond to the challenge to become water efficient. It acts as a central repository for relevant information and further advice, so that you can actually achieve significant savings. It also showcases those companies with products that will assist you in your goal.
小题1:Can you infer where this passage is from?
| A．newspaper | B．TV programme | C．Radio broadcast | D．Internet |
| A．find more water resources |
| B．use less water everywhere, every time |
| C．realize the importance of saving water |
| D．unlock economic benefits of being water efficient |
| A．There are more and more people in the world. |
| B．The water resources are limited. |
| C．Agriculture needs more water. |
| D．The water is very important for us. |
| A．Water is very important for the human. |
| B．Everybody has a responsibility to save water. |
| C．It"s time to be water efficient. |
| D．Let’s save water for our future generations. |
The dogs were brought in after sound equipment found sounds coming from deep inside the ruins, at a place where a school stood before the mudslide covered it. The sounds could mean people are still alive under all the mud or it could just be the earth resettling.
On Monday, rescue workers worked at the school site until three in the morning, trying to locate survivors, and they will begin digging again as soon as the dogs think they find someone.
Human teams from the US, Malaysia, and Australia are all trying to help, too. But so far they have yet to locate any survivors. Rescue workers told CNN that an earlier report that 50 survivors had been found was false.
How did all that mud bury the village in the first place? On Friday, 2,400-foot Mt Kanabag turned into a mudslide after two weeks of constant rain weakened it. The mountain crumbled and the mud fell onto the village Guinsaugon, burying the 1,800 people who lived there . Out of the 300 houses in the village, only 3 were not covered by the mud . The village is on a southern Philippine Island called Levte. Rescue efforts have been difficult because the village takes six hours to reach from the nearest airport. Hopefully, the dogs can help their human friends find survivors.
小题1:According to the search officials’ words in the first paragraph, we can learn that_________
| A．the smell of rescue teams can disturb the dogs |
| B．the dogs can follow the smell of rescue teams |
| C．the gods can’t smell the rescue teams |
| D．the dogs can tell the differences between people and rescue teams |
| A．to show the way to rescue the victims in the ruins |
| B．to introduce the instruments to save victims in a disaster |
| C．to tell readers that dogs can smell out victims buried in the ruins |
| D．to show how to train dogs to save victims in a mudslide |
| A．50. | B．Only a few. | C．1,800. | D．None. |
| A．the rain was heavy |
| B．so many people were buried |
| C．it was difficult to reach the village |
| D．these is little chance to save the survivors |
| A．broke | B．shook | C．fell | D．moved |
Bipedalism—walking on two feet, is one of the defining characteristics of being humans, and scientists have debated for years how it came about. In the latest attempt to find an explanation, researchers trained five chimps(黑猩猩)to walk on a treadmill(跑步机)while wearing masks that allowed measurement of their oxygen consumption. The chimps were measured both while walking upright and while moving on their legs and knuckles(膝关节).That measurement of the energy needed to move around was compared with similar tests on humans and the results are published in this week’s online edition of “Proceedings of the National Academy of Sciences”.
It turns out that humans walking on two legs use only one-quarter of the energy that chimps use while knucklewalking on four limbs(肢).And the chimps, on average, use as much energy using two legs as they did when they used all four limbs.
However, there were differences among chimps in how much energy they used, and this difference corresponded to their different manner of walking and anatomy(解剖构造).One of the chimps used less energy on two legs, one used about the same and the others used more, said David Raichlen, assistant professor of anthropology at the University of Arizona.
“What we were surprised at was the variation(变异) ”, he said in a telephone interview. Interview. “That was pretty exciting, because when you talk about how evolution works, variation is the bottom line, without variation there is no evolution.”
Walking on two legs freed our arms, opening the door to drive the world, said Raichlen. “We think about the evolution of bipedalism as one of first events that led hominids(原始人)down the path to being humans.”
The research was supported by the National Science Foundation and the L.S.B.Leakey Foundation.
小题1: The underlined word “Bipedalism” in Paragraph 2 probably means____.
| A．moving sideways | B．walking upright |
| C．walking on four legs | D．running fast |
| A．scientists have no idea on how humans’ walking on two legs came about |
| B．scientists have had different views on why chimps walk on four legs |
| C．scientists have had different views on how humans’ walking on two legs vame about |
| D．scientists have had similar views on how humans’ walking on two legs came about |
| A．How chimps saved energy. |
| B．Why chimps didn"t walk on two legs. |
| C．David Raichlen studied chimps. |
| D．Different chimps consumed different energy. |
| A．conserve energy | B．differ from other animals |
| C．free their brains | D．strengthen their legs |
A team from North Carolina State University found the remains in a fossil(化石)of the leg bone of a Tyrannosaurus rex（暴龙）in Montana, US.
The last dinosaurs on Earth died some 65 million years ago, but they left bits of themselves behind wherever they lived. Around the world ,dug-up bones and fossils have given scientists many ideas about what the animals were like.
Preserved by minerals, the newly discovered leg bone was hard. So the scientists used a liquid to dissolve（溶解）the minerals. A week later, the remaining material was soft and stretchy（有弹性的）,which surprised the researchers.
Some of the materials appeared to be a network of blood vessels. Out of these, the researchers were able to squeeze(挤出)tiny , round, dark-red and deep-brown structures that seemed to be ancient blood cells.
Scientists are overjoyed by this discovery because most fossils come from hard body parts, like bones and shells, which last a long time. Soft tissues, like skin, muscle, and organs are very hard to find because they tend to break down more quickly.
Scientists think that the new discovery will help them to better understand how fossils form. Future finds should also help flesh out how the dinosaurs lived.
They were also very excited by the possibility of having some dinosaur DNA.From that scientists could create a real life “Jurassic Park”.
In the Hollywood movie, scientists reproduced dinosaurs from the DNA they found in a mosquito fossil and disaster soon followed.
小题1:Scientists are excited _________________________ .
| A．because they have got dinosaur DNA |
| B．about making a movie called “Jurassic Park” |
| C．because they found the liquid to dissolve fossils |
| D．because it,s very hard to find soft tissues in fossils |
| A．what the animals were like | B．how fossils form |
| C．how the dinosaur lived | D．how to get dinosaur DNA |
| A．add more details or information to | B．take more photos of |
| C．make the public know more about | D．find the answer to |
| A．It could make it possible to make dinosaurs return to the former position. |
| B．It could throw light on how dinosaurs lived many years ago. |
| C．It could prove what dinosaurs were like. |
| D．It could explain why dinosaurs died some 65 million years ago. |
I was arranging to meet someone for dinner last week, and I said “I’ll pencil it in my diary”, and my friend said “You can ink it in”, meaning that it was a firm arrangement not a tentative one!
Many of these new verbs are linked to new technology. An obvious example is the word fax, which is a shortening of facsimile originally, an exact copy of a book or document. We all got used to sending and receiving faxes, and then soon started talking about faxing something and promising we"d fax it immediately. So, nouns turn into verbs in two easy stages. Then along came email, and we were soon all emailing each other madly. How did we do without it? I can hardly imagine life without my daily emails.
Email reminds me, of course， of my computer and its software, which has produced another couple of new verbs. On my computer I can bookmark those pages from the World Wide Web that I think I"ll want to look at again, thus saving all the effort of remembering their addresses and calling them up from scratch. I can do the same thing on my PC, but there I don"t bookmark; I favorite—coming from “favorite pages”, so the verb is derived from an adjective not a noun． I wasn’t really sure whether people said this，but someone told me recently that they had favorited a site I was looking for and so they could easily give me its address.
In the late 1980s I noticed that lots of my friends had acquired pagers, and kept saying things like “I’ll page you as soon as I know what time we’re meeting”. They couldn"t say it to me, though; 1 refused to have one． So my children bought me a mobile phone, now known simply as a mobile and I had to learn yet more new verbs. I can message someone, that is, I can leave a message （either spoken or written）for them on their phone．Or I can text them, write a few words suggesting when and where to meet, for example. How long will it be before I can mobile them, that is, phone them using my mobile? I haven’t heard that verb yet, but I’m sure I will soon. Perhaps I’ll start using it myself!
小题1:“I’ll pencil it in my diary” in the second paragraph probably means .
| A．it was a firm arrangement | B．it was an uncertain arrangement |
| C．the arrangement should be written as a diary | D．he prefers a pencil to a pen |
| A．emailed | B．messaged | C．favorited | D．texted |
| A．message | B．page | C．email | D．mobile |
| A．New Verbs from Old Nouns | B．The Development of the English language |
| C．New Technology and New words | D．Technology and Language. |
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