单项选择题

A biology teacher made several tests with different animals tn find out which animal was the cleverest ______.

A．before long
B．long before
C．not long ago
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单项选择题
After the teacher left the room, the monkey began to ______.
A．put one of its eyes to the keyhole
B．be on guard(守卫，防护装置)
C．look at the keyhole
单项选择题
'The best (最好的)way to pass an examination is to work hard all the year round.
A．Right.
B．Wrong.
C．Doesn't say.
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