单项选择题

I hope they won't have to wait all day long for the mail to arrive,______

A．will they
B．do they
C．don' t they
D．have they
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单项选择题
You can get anything, so long as you stick to it, and stick to it hard enough and long enough. Anything______.
A．anyhow
B．whatever
C．however.
D．somehow
单项选择题
Researchers______ that genes may determine the strength of the immune system which could help explain how an infectious disease could have a hereditary link.
A．speculate
B．estimate
C．evaluate
D．anticipate
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