单项选择题
The underlined word "they" in the last sentence of the first paragraph refers to ____________.
A．birds and parasites
B．birds and sheep
C．parasites and sheep
D．sheep, birds and parasites
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单项选择题
After putting the Japanese watch in water for 20 minutes, two scientists found ________.
A．it was a good watch
B．it went forward
C．it went faster than the Swiss one
D．it went backwards 120 minutes
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单项选择题
The two scientists were quarrelling at the beginning of the story, because __________.
A．the Japanese watch was better
B．the German watch was better
C．each of them thought his own watch was better than the other's
D．both the watches were wrong
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at→at
With→Without
short→shortly
beaten→beat
stand→standing