单选题
Some desert animals can survive the very strong summer heat and dryness because they have very unusual characteristics. The camel, for example, can
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an increase in the temperature of its body and its blood of 9℃. In addition, it can drink an enormous
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of water at one time, then store
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water in its red blood cells and other parts of its body to
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its needs for two weeks or more. The kangaroo rat, on the other hand,
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all the water it needs from water that it produces during
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However, most animals need to
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a fairly constant body temperature, and will die if it
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more than 5℃.
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, they need to find some ways to
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the strong sun rays. Nor can many animals either store or
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water in their bodies, as the camel and kangaroo rat
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. So they must find ways to
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water loss from their bodies to the lowest degree.
Because very few desert animals can
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the strong rays, the temperature, and the evaporation rate
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a typical summer"s day, most of them are
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during the night. Only after the sun has set does the desert come fully to life. The night is relatively cool, and the darkness provides
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, not only from the sun, but also from other animals and from the birds. So the coming of darkness is the signal
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the large majority of animals and insects
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their search for water and food. When morning comes, most of them seek
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again. Many go underground; nearly all find somewhere shady where they can avoid the sun rays.
【答案解析】[解析] 此题属于词语搭配题。amount of为固定词组，意为“大量”，修饰不可数名词。此处需选一个名词修饰water，故选项C. amount正确。选项A. level意为“水平，高度，水准”，不能由enormous修饰；选项B. number: a number of意为“许多”，修饰可数名词；选项D. sum意为“总数”，a sum of表示金额。
【答案解析】[解析] 此题属于词语搭配题。B. offer意为“提供”，后面可跟双宾语，例如：She offered me a cup of tea. 但文中宾语为need故选项B. offer排除；选项C. provide意为“供应，提供”，也无法与need连用。选项D. meet意为“满足”，例如：The index can meet need for design．但下文中强调的是“储存在红细胞中的水分来提供长时间的需求”，故A. supply为正确答案。
【答案解析】[解析] 此题属于词语搭配题。选项A. function表示“运行”，通常指的是机器功能上的运行，选项C. perform意为“表现，执行”，例如：His council had to perform miracles on a tiny budget．选项D. appear意为“出现，显得”，例如：He is anxious to appear a gentleman.文中意思，其他动物不具有像骆驼和长鼻袋鼠那样的能力，用can来指代这种能力，故选项B. can正确。
【答案解析】[解析] 此题属于词语搭配题。从文中意思可知，很少动物能在严酷的沙漠环境中存活。选项D. experience意为“经历”，例如：We had never expel5enced this kind of holiday before and had no idea what to expect.选项B. stand和C. endure都表示“忍受，承受”，虽然在语法上正确，但是效果不如“survive”强烈，全篇文章都在说明沙漠动物存活的能力，故选项A. survive最恰当。
【答案解析】[解析] 此题属于语义搭配题。根据文中意思，在晚上，动物们都变得活跃了。由此可知“most of the desert animal”为主语，选项B. dynamic意为“动态的，有活力的”，例如：South Asia continues to be the most dynamic economic region in the world.选项C. lively意为“活泼的，生动的”不能用来形容animal，选项D. busy“忙碌的”同样不合适，选项A. active表示“积极的，活跃的”，用来形容沙漠动物晚上开始变得活跃了，故选项A. active正确。