单项选择题

Modern plastics can______ very high and very low temperatures.

A．stand
B．hold
C．carry
D．support
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单项选择题
________ under a microscope, a fresh snowflake has a delicate six-pointed shape.
A．Seeing
B．Seen
C．To see
D．To be seen
单项选择题
The question_________ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
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