单项选择题

A．The cassette player.
B．The sales slip.
C．Worth of tapes.
D．Warranty’s expired.
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单项选择题
A．Motor vehicles were constantly arriving or departing.B．Tasty food.C．A comfortable, medium- sized hotel.D．Old - fashioned service.
A．Motor vehicles were constantly arriving or departing.
B．Tasty food.
C．A comfortable, medium- sized hotel.
D．Old - fashioned service.
单项选择题
Now scientists have found in the past few years______.
A．the exposure of DNA to the public is unnecessary
B．the tiny cell in DNA is a neat little machine
C．man knows nothing about DNA
D．man has much to learn about DNA
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