单项选择题

A．The largest sea creatures ever known.
B．Fish living in shallow waters.
C．Plant-eating land animals.
D．Meat-eating land animals.
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单项选择题
A．Headache.B．Earache.C．Toothache.D．Stomachache.
A．Headache.
B．Earache.
C．Toothache.
D．Stomachache.
单项选择题
The price of natural gas is cheaper and more stable than that of gasoline.
A．Y
B．N
C．NG
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