2. 专升本
  3. Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two ki

Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two ki

admin2010-07-11  117
问题     Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites(寄生虫)on the sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So, although they can manage without each other, they do better together.
    Sometimes an animal has a plant partner. The partnership develops until the two partners cannot manage without each other. This is so in corals(珊瑚)of the sea. In their skins they have tiny plants which act as "dustmen" , taking some of the waste products from the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they can not live normally, the corals will die.
The underlined part "giving in return oxygen" in the second paragraph means______.
选项 A、returning back the coral oxygen to the corals
B、giving oxygen to the coral as debts
C、giving oxygen to the coral in exchange
D、producing oxygen for the coral
答案C
解析
转载请注明原文地址:https://kaotiyun.com/show/F8LC777K
本试题收录于： 英语题库普高专升本分类
0

英语

普高专升本

相关试题推荐
随机试题
最新回复(0)