2. 外语
  3. On the whole, the passage is mainly about ______. Why is the tsetse fly a problem in Africa?

On the whole, the passage is mainly about ______. Why is the tsetse fly a problem in Africa?

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问题 On the whole, the passage is mainly about ______.
Why is the tsetse fly a problem in Africa?
选项 A、People do not like the sound it makes.
B、It eats food that people need.
C、It has killed many cattle herds.
D、It can destroy the crop there.
答案C
解析 推理题。文章第三段说采采蝇能致动物生病，在某些地方甚至可能摧毁整群家畜，可推知[C]项为答案。
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