The camel--often called the ship of the desert--is one of the most successful desert animals. Camels can go for long pe- riods without water, but eventually they must drink. When water becomes available to them after a long drought, they may drink 95 liters of water or more. When water is not available, what helps camels survive the desert heat is the fat stored in their humps (驼峰). A camel's hump contains about 12 kilograms of fat. Fat is rich in hydrogen. As the fat is digested, hydrogen from the fat combines with oxygen in the air that the camel breathes. The result is H20, or water. Each kilogram of fat that a camel digests produces about a liter of water.
1.
Desert
animals
are
usually
more
active
at
night because
.
A. it is cooler at night
B. it is easier to find water
C. they like the dark
D. they are less likely to be attacked at night
答案:
2. Which of the following desert animals can get water only
from the food?
A. The camel
B. The kangaroo
C. The frog
D. The rat.
答案:
3. Which of the following is TRUE according to the passage?
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