单项选择题

China and America are separated by __

A．Pacific Ocean
B．a Pacific Ocean
C．the Pacific Ocean
D．Pacific Oceans
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单项选择题
Green ___ have the power to make food from substances found in the air and soil.
A．only plants
B．plants alone
C．the only plants
D．plants are alone
单项选择题
The instructions are too clear on the bottle: These tablets __ they are able to make about twenty different sounds.
A．will be kept
B．are to be kept
C．shall keep
D．shall have kept
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