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  3. Animals in the Desert Some desert animals can survive the very strong summer heat and dryness because they have very unusual cha

Animals in the Desert Some desert animals can survive the very strong summer heat and dryness because they have very unusual cha

admin2009-06-15  58
问题                          Animals in the Desert
Some desert animals can survive the very strong summer heat and dryness because they have very unusual characters. The camel, for example, can(51)an increase in the temperature  of its body and its blood of 9℃. In addition, it can drink an enormous amount of water at one time, then store sufficient water in its red blood cells and other parts of its body to supply its needs for two weeks or more. The kangaroo rat (长鼻袋鼠) ,on the other hand,(52)all the water it needs from water that it produces during respiration (呼吸). However, most animals  need to(53)a fairly constant body temperature, and will die if it rises more than 5℃.(54),they need to find some way to avoid the strong sun rays. Nor can many animals either store or produce water in their bodies, as the camel and kangaroo rat can. So they must find ways to(55)water loss from their bodies to the lowest degree.
Because very few desert animals can survive the strong rays, the temperature, and the evaporation
(蒸发) rate(56)a typical summer’s day, most of them are(57)during the night. Only after the sun has set does the desert come fully to life; The night is(58)cool, and the darkness provides(59),not only from the sun, but also from other animals and from the birds. So the coming of darkness is the signal(60)the large majority of animals and insects (昆虫) to continue their search for water and food. When morning comes, most of them seek shelter again: many go underground; nearly all find(61)shady and they can avoid the sun rays there.
For many kinds of insects, living in the desert is(62)than for animals. Like many desert plants, they have a waterproof skin which(63)water loss by evaporation. In addition, some insects spend all or most of their life below ground. Here, for most of the year at least, there is(64)wetness, and it is generally cooler than on the(65).
选项 A、easier
B、better
C、safer
D、harder
答案A
解析
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