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

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单项选择题
Doctor Adams explained that not all bacteria harmful（）.

A．were
B．are
C．was
D．is
单项选择题
The policemen hurried to the spot of traffic accident where there was a large crowd of（）.

A．looker-on
B．lookers-ons
C．looker-ons
D．lookers-on
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