About 97% of the world"s water is salty and is found in our oceans and seas. But

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About 97% of the world"s water is salty and is found in our oceans and seas. But, as we can"t drink seawater, how can it be important?
Every part of our seas and oceans contains an amazing number of animals and fish that live at different ocean depths. Most of the different species of animals and fish depend on simple plants for their food. These simple plants called algae (海藻) drift near the surface of the ocean and use sunlight to turn carbon dioxide and water into food and oxygen. In fact, algae produce over half of the oxygen people breathe. How important seawater is!
Each plant or animal in our seas and oceans is an important link in a food chain. The algae are eaten in large amounts by microscopic animals, which are in turn consumed by larger animals. These food chains are delicately balanced.
The bad news about the food chains in the oceans is that they are under threat because of man. People once thought that the oceans were so big that it didn"t matter if we dumped rubbish into them or caught huge quantities of fish and whales for food. But we now know this is not true and fish stocks in the oceans have started to drop.
Thankfully, the world is taking steps to protect the future of our oceans by introducing international agreements to protect marine habitats. Most countries have introduced fishing restrictions to protect fish stocks in the oceans and new techniques are being pioneered to cope with pollution. Finally, the importance of protecting oceans is being made known to more people. This is just the beginning of a long process to protect the oceans for our future. We depend on the oceans for fish which are an important part of the human diet. How important seawater is!
小题1:People used to think that the rubbish thrown into the sea ________.

A．wouldn"t harm the fish in the sea

B．would change the balance of the food chain

C．would be broken down in the sea

D．wouldn"t do much harm to the sea

小题2:From the passage, we learn that ________. 

A．most fish and sea animals live at the surface of the seas

B．it is very difficult to break the balance of a food chain

C．excessive fishing has caused the decrease in fish stock

D．it won"t be long before the problems concerning oceans will be solved

小题3:Which of the following is NOT a way being used to protect oceans?

A．The use of international agreements.

B．Forbidding fishing to protect fish stocks.

C．The use of new techniques.

D．Raising people"s awareness of the need to protect oceans.

小题4:What would be the BEST title of the passage?
A. The importance of seawater.
B. Life in the oceans.
C. How to protect food chains.

答案

小题1:D
小题2:C
小题3:B
小题4:A

解析

试题分析：本文讲述的海洋以及海水对人类的重要性，同时也描述了海洋的现状以及人们为了保护海洋所做的努力。
小题1:D 细节题。根据文章第四段前三行People once thought that the oceans were so big that it didn"t matter if we dumped rubbish into them or caught huge quantities of fish and whales for food.可知以前人们认为向海洋里扔垃圾是没有关系的，故D正确。
小题2:C 细节题。根据文章第四段最后一句But we now know this is not true and fish stocks in the oceans have started to drop.可知现在人们已经知道过度捕捞让 海洋里的鱼变少了。故C正确。
小题3:B 细节题。根据文章最后 一段Thankfully, the world is taking steps to protect the future of our oceans by introducing international agreements to protect marine habitats. Most countries have introduced fishing restrictions to protect fish stocks in the oceans and new techniques are being pioneered to cope with pollution. Finally, the importance of protecting oceans is being made known to more people. This is just the beginning of a long process to protect the oceans for our future. We depend on the oceans for fish which are an important part of the human diet. How important seawater is!可知ACD三项都是本文所讲述的保护海洋的方法。B项文章没有提及。
小题4:A 主旨大意题。根据文章第二段最后一句In fact, algae produce over half of the oxygen people breathe. How important seawater is!可知海水对我们人类来说是非常重要的。故本文讲述的是海水的重要性。A正确。
点评：本文讲述的海洋以及海水对人类的重要性，同时也描述了海洋的现状以及人们为了保护海洋所做的努力。文章基本上是考查细节题，对此类题型考生可以首先从问题中找到关键词，然后以此为线索，运用略读及查阅的技巧在文中迅速寻找这一细节，找到后再把这一部分内容仔细阅读一遍，仔细比较所给选项与文中细节的细微区别，在准确理解细节的前提下，最后确定最佳答案。