单项选择题

（）is really a burden to a small boy.

A．Ten pounds'weight
B．Ten pounds weight
C．Ten pound weights
D．Ten pound weight

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单项选择题

This tank is big enough for ten gallons．It is a（）.

A．ten-gallon-tank
B．ten-gallons tank
C．ten-gallon tank
D．ten-gallons-tank

单项选择题

Doctor Adams explained that not all bacteria harmful（）.

A．were
B．are
C．was
D．is

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