A. It"s far from the sea.
B. It"s far from the north.
C. It"s near the Great Lakes.
D. It has many mountains.
If you know how to study wine, it can tell you about its history and qualities. Many wine experts can
even identify the kind of wine without ever seeing the label on the bottle. Studying a wine involves using
several senses, not just taste.
First, pour the wine into a glass and look at it. It might help to put a piece of white paper behind the
glass so you can see the color clearly. Color can tell a lot about the kind of grapes, where the wine is from
and its age. A white wine might be almost colorless. White wines to darker with age. White wines made
from grapes grown in a cool climate are often paler, with a higher amount of acid. White wines from grapes
grown in a warmer climate are often yellower, with less acid. The color of red wines can be purplish red
to brick red. Red wines often become paler with age. Red wines grown in warmer climates often have deeper
color than those grown in cooler climates.
Next, turn the glass so that the wine moves around inside. This brings air into the wine, so that it gives
off its smell. Smell the wine deeply. A wine"s smell is actually telling more than its taste. To use a wine term,
what can you learn about the wine from its "nose"? Is the wine fruity? Does it smell like oak (橡树)? Do you
smell grass or maybe honey? Maybe the smell is like butter or a mineral.
Now it is time to taste the wine. Move it around in your mouth. You may recognize some tastes because
you identified them while smelling the wine. You can also consider the wine"s sweetness and its acidity (酸性).
You may note the taste of tannin. Tannins are chemicals that are found in the skin and seeds of grapes. Tannins
taste bitter and seem to coat your mouth. To make a good wine requires a balance between sugar, acidity,
tannin and alcohol.
Professional wine tasters have many special words to describe wines. Some adjectives might be surprising.
For example, a wine that feels smooth might be described as "velvety" or "silky". A wine that does not have
enough acidity is "flabby" or "fat". A wine with a strong tannin taste could be "chewy".
A few weeks ago, an asteroid (小行星) almost 30 feet across and flying along at 38,000 miles per hour
flew 28,000 miles above Singapore. Why, you might reasonably ask, should we care about a near miss from
such a tiny rock? Well, I can give you one very good reason: asteroids don"t always miss. If even a relatively
little object was to strike a city, millions of people could be wiped out.
Thanks to telescopes that can see ever smaller objects at ever greater distances, we can now predict
dangerous asteroid impacts decades ahead of time. We can even use current space technology and fairly
simple spacecraft to alter an asteroid"s orbit enough to avoid a collision. We simply need to get this detection-
and-deflection program up and running.
President Obama has already announced a goal of landing astronauts on an asteroid by 2025 as a pioneer
to a human mission to Mars. Asteroids are deep-space bodies, orbiting the Sun, not the Earth, and traveling
to one would mean sending humans into solar orbit for the very first time. Facing those challenges of radiation,
navigation and life support on a months-long trip millions of miles from home would be a perfect learning
journey before a Mars trip.
Near-Earth objects like asteroids and comets-mineral-rich bodies bathed in a continuous flood of sunlight-
may also be the ultimate resource depots for the human being.
To be fair, no one has ever seen the sort of impact that would destroy a city. The most instructive incident
took place in 1908 in the remote Tunguska region of Siberia, when a 120-foot-diameter asteroid exploded
early one morning. It probably killed nothing except reindeer (驯鹿) but it flattened 800 square miles of forest.
Statistically, that kind of event occurs every 200 to 300 years.
Luckily, larger asteroids are even fewer and farther between-but think of the asteroid seven to eight miles
across that annihilated the dinosaurs (and 75 percent of all species) 65 million years ago.
Certainly, when it comes to the far more numerous Tunguska- sized objects, to date we think we"ve
discovered less than a half of I percent of the million or so that cross Earth"s orbit every year. We need to
pinpoint (定位) many more of these objects and, predict whether they will hit us before it"s too late. With a
readily achievable detection-and-deflection system we can avoid the dinosaurs" fate.
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