单项选择题

When climbing the hill, John was knocked unconscious by an______ rolling stone.

A．untouched
B．unfamiliar
C．unexpected
D．unbelievable
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单项选择题
Modern plastics can______ very high and very low temperatures.
A．stand
B．hold
C．carry
D．support
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
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