单项选择题

Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.

A．Devices
B．Hypotheses
C．Efforts
D．Suggestions
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单项选择题
The term composition refers to the way the components of a drawing are arranged by the artist.
A．painted
B．imagined
C．put together
D．sharply perceived
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