2. 职称英语
  3. An adult giraffe’s head is about six feet above its heart. This means that to 【C

An adult giraffe’s head is about six feet above its heart. This means that to 【C

游客2023-07-17  64
问题 An adult giraffe’s head is about six feet above its heart. This means that to 【C1】______ enough blood up to the brain the circulatory 【C2】______ must be strong enough to keep the blood at very high pressure.
Biologists have known for some time that giraffes solve this problem by having 【C3】______ high blood pressure, about 【C4】______ that of human beings. But an international team of biologists began to 【C5】______ about this. If giraffes have such high blood pressure, they should have a 【C6】______ problem with swelling in their legs and feet. Why don’t giraffes have swollen feet?
    Giraffes should have 【C7】______ problem, too. Every time they bend heads 【C8】______ to drink, the blood should 【C9】______ to their heads and have a hard time 【C10】______ back up (when the head is down) to the heart. How come giraffes don’t black out when they drink?
    The answer to the 【C11】______ feet problem, the researchers found, is that giraffes have 【C12】______ the researchers call a "natural anti-gravity suit". It 【C13】______ out that the skin and other 【C14】______ in their legs and feet are 【C15】______ stiffer and tougher than those of other 【C16】______ . As a result, the blood vessels in the leg cannot swell.
    Therefore, the blood has nowhere to go but back to the heart. What about blood rushing to the head 【C17】______ the giraffe bends down to drink? The researchers found that the giraffe’s jugular vein, which 【C18】______ blood from the head back to the heart, has lots of one-way valves in it. In the giraffe’s neck, there are lots of muscles that flex and relax repeatedly as the animal moves its head and sucks 【C19】______ drinking water. By squeezing the valved jugular vein, they 【C20】______ blood moving back to the heart even while the animal is drinking. [br] 【C1】
选项 A、bring
B、produce
C、transfer
D、pump
答案 D
解析 词义辨析题，文章第一句就指出，成年长颈鹿的脑袋在心脏以上6英尺高的地方，空格所在句子意思是：这意味着，要______足够的血液到大脑，循环______必须足够强壮才能保持血液有很强的压力，pump除了表示“用泵抽”之意，还可以表示“(用泵拉取)注入”，符合句意，所以D正确
转载请注明原文地址:http://tihaiku.com/zcyy/2845173.html
相关试题推荐
随机试题
最新回复(0)