单项选择题

A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
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单项选择题
A．Because the Americans found they were from Germany.B．Because people thought they contained dog meat.C．Because people had to get used to their taste.D．Because it was too hot to eat right away.
A．Because the Americans found they were from Germany.
B．Because people thought they contained dog meat.
C．Because people had to get used to their taste.
D．Because it was too hot to eat right away.
单项选择题
The reason why 1994 was exceptional is that _______.
A．it saw an unusually large number of tourists to the U.S.
B．it witnessed a drop in the number of tourists to the U. S.
C．tourism was hardly affected by the weakening of the U.S. dollar that year
D．tourists came to the U.S. for sightseeing rather than for bargains that year
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