任务一 完形填空
In late November, the weather begins to get very cold. If you visit the vegetable market during this time, you may see something ______ 1 ______ . There are often groups of vegetables that look like "ugly ducklings". They do not look fresh and smooth. They look old and wrinkled(皱巴巴的) because of the cold frost(霜) outside.
You may think these vegetables are not good to eat
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they look ugly. However, they have a big secret. If you taste them, they are very delicious. They taste quite sweet, almost like someone has put
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into them.
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are old and wrinkled vegetables sweeter than fresh and smooth ones? That's because vegetables are
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living things. They want to stay alive in the winter. If the water
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their bodies turns into ice, they will die(死). So, they have a clever way to save themselves.
Vegetables have something called "starch"(淀粉) inside them. When the temperature(气温) goes down, they
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change this starch into sugar. This is very important because of an easy scientific
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: water turns to ice very easily, but sugar water does not. By having a lot of sugar in them, the vegetables
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it much harder for the water inside them to turn to ice.
This change
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the vegetables from the cold weather. It stops them from dying of cold. For us, it is also great news. It means we can enjoy vegetables that are naturally sweet and tasty. So, these vegetables are not just ugly. In fact, they are very smart.
(
) 1. A. true B. cold C. modern D. strange
(
) 2. A. or B. but C. because D. till
(
) 3. A. salt B. sugar C. milk D. water
(
) 4. A. How B. Why C. What D. Which
(
) 5. A. colourful B. large C. smart D. lovely
(
) 6. A. inside B. beside C. under D. over
(
) 7. A. clearly B. quickly C. really D. finally
(
) 8. A. fact B. plan C. dream D. survey
(
) 9. A. get B. carry C. keep D. make
(
)10. A. protects B. empties C. borrows D. grows
