高等教育 / 新发展英语综合教程（二）
We can conclude _ _ _ _ _ _ _ _ from the passage.
A、man has known the cause of yellow fever but doesn''t know how to get rid of it
B、man has known the cause of yellow fever and gotten rid of it from the world
C、man hasn''t known the cause of yellow fever exactly and there was a long way
D、man has known the cause of yellow fever and has achieved some success.
A、man has known the cause of yellow fever but doesn''t know how to get rid of it
B、man has known the cause of yellow fever and gotten rid of it from the world
C、man hasn''t known the cause of yellow fever exactly and there was a long way
D、man has known the cause of yellow fever and has achieved some success.
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