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
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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
单项选择题
As resident of Texas, Dennis __ to the House of Representatives in 1930 and to the Senate in 1938.
A．when elected
B．elected
C．who was elected
D．was elected
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