单项选择题

The scientist has made quite a few discoveries, ______ of great importance to the whole world.

A．which I think they are
B．which I think are
C．I think which are
D．that I think they are
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单项选择题
Hardly a month goes by without ______ of another survey revealing new depths of scientific illiteracy among US citizens.
A．words
B．word
C．a word
D．the word
单项选择题
______ me most was that the young boy who had lost both arms in an accident could handle a pen with his feet.
A．That amazed
B．It amazed
C．Which amazed
D．What amazed
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