单项选择题

Why might the increasing number of whales cause problems with their health（）

A．There’s not enough room for them in Alaska.
B．There may not be enough food for them in Alaska.
C．They get pushed ashore.
D．There are more whales to spread diseas

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单项选择题

Jee Hock knew the tiger was near. He （）

A．went to sleep
B．cried
C．sat down and waited
D．lay down quietly

单项选择题

Generally speaking, a man can tell （）different odors.

A．five million
B．more than 10,000
C．fewer than 10,000
D．no more than 10,000