On the whole, the passage is mainly about ______. Which statement does this passage lead you to believe?

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问题 On the whole, the passage is mainly about ______.
Which statement does this passage lead you to believe?

选项 A、It won’t be easy to get rid of the tsetse flies in Africa.
B、Sleeping sickness is unknown to Africans.
C、People did not know sleeping sickness could cause deaths.
D、The people there did not know the tsetse carried a kind of disease to man.

答案A

解析 文章最后一句说消灭采采蝇是一个艰巨而长期的任务。所以A正确。
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