单项选择题

The conference has been held to discuss the effect of tourism ______the wildlife in the area.

[A] in
[B] on
[C] at
[D] with

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单项选择题

-How long are you staying -I don't know．______．

[A] That's OK.
[B] Never mind.
[C] It depends.
[D] It doesn't matter.

单项选择题

Although he has taken a lot of medicine, his health ______poor.

[A] proves
[B] remains
[C] maintains
[D] continues

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