单项选择题

Acetate is one of the most important artificial fibers.

A．insulating
B．synthetic
C．unadorned
D．complex
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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
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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