re, and also because it is needed to block other unpleasant tastes in food.” said Hayes. "Supertasters, people who experience tastes more intensely, consume more salt than do nontasters. Snack foods have saltiness as their primary flavor, and at least for these foods, more is better, so the supertasters seem to like them more.”

    However, supertasters also need higher levels of salt to block unpleasant bitter tastes in foods such as cheese, Hayes noted. "For example, cheese is a wonderful blend of dairy flavors from fermented milk, but also bitter tastes from ripening that are blocked by salt," he said. "A supertaster finds low-salt cheese unpleasant because the bitterness is too pronounced."

    Hayes cited research done more than 75 years ago by a chemist named Fox and a geneticist named Blakeslee, showing that individuals differ in their ability to taste certain chemicals. As a result, Hayes explained, we know that a wide range in taste acuity exists, and this variation is as normal as variations in eye and hair color.

   "Some people, called supertasters, describe bitter compounds as being extremely bitter, while others, called nontasters, find these same bitter compounds to be tasteless or only weakly bitter." he said. "Response to bitter compounds is one of many ways to identify biological differences in food preference because supertasting is not limited to bitterness.”

41.  John Hayes points out in a recent study that

A. it is healthy to eat food without salt.

B. many people reject low-salt food completely.

C. food with less salt tastes better.

D. many people accept low-salt tasteless food reluctantly.

42. The fourth paragraph describes briefly

A. the purpose of the study.

B. the analysis of the research results.

C. the research methodology.

D. the conclusion of the study.

43. The article argues that supertasters

A. like snack foods as saltiness is their primary flavor.

B. like the taste of saltiness to block sweet tastes in food.

C. consume less salt because they don't like intensive tastes.

D. like to share salty cheese with nontasters.

44. In paragraph 6, the word "pronounced" is closest in meaning to

A. weary.

B. strong.

C. weak.

D. strange.

45. The last two paragraphs illustrate that taste acuity is

A. developed over time after birth.

B. related to one's eye and hair color.

C. still unknown to scientists.

D. genetically determined.

【答案】：DCABD

第5部分：补全短文（第46～50题，每题2分，共10分）

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The Mysteries of Nazca

In the desert of Peru, 300 kilometers from Lima, one of the most unusual artworks in the world has mystified (迷惑) people for decades.(46) But from high above, these marks are huge images of birds, fish, seashells, all beautifully carved into the earth.

The Nazca lines are so difficult to see from the ground that they weren’t discovered until the 1930s, when pilots spotted them while flying over the area. In all, there are about 70 different human and animal figures on the plain, along with 900 triangles, circles, and lines.

Researchers have figured out that the lines are at least 1,500 years old, but their purpose is still a mystery.            (47) However, it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.

In the 1940s, an American explorer named Paul Kosok suggested that the drawings are a chronicle (记录) o