单项选择题

She is a very （） student.She's always talking about traveling to outer space.

A.imaginary
B.imaginalive
C.imaginable
D.imagining

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单项选择题

Until recently, body heat has caused problems because it （）.

A.was difficult to collect
B.came in a variety of forms
C.was difficult to get rid of
D.tended to be absorbed by physical objects

单项选择题

This radar system is significant because it （）.

A.is the first radar system to work in space
B.is more precise than microwave radar
C.is easier to operate than microwave radar
D.will work on the earth's surface as well as in space