单项选择题

The results are hardly ______ ; he cannot believe they are accurate.

A．crucial
B．critical
C．credible
D．contrary

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单项选择题

I think I was at school, _______ I was staying with a friend during the vacation when I heard the news.

A．or else
B．and then
C．or so
D．even so

单项选择题

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

A．inclined to
B．subjected to
C．prone to
D．bound to

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