单项选择题

Human beings are superior to animals______they can use language as a tool to communicate.

A．like
B．while
C．when
D．for
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单项选择题
So little ______ about mathematics that the lecture was complete beyond me.
A．I know
B．do I know
C．I knew
D．did I know
单项选择题
There are a lot of bitter stories ______ his success.
A．after
B．behind
C．under
D．down
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