单项选择题

The scientists have absolute freedom as to what research they think it best to ______.

A．engage
B．devote
C．seek
D．pursue
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单项选择题
What will definitely happen upon Telstar Tina’s reentry
A．It will distintegrate.
B．There could be damage to houses.
C．The satellite will no longer function.
D．Many pieces will fall into the oceans.
单项选择题
What is the size of the piece of Telstar Tina expected to strike the earth
A．Several ounces.
B．Large enough to kill the dinosaurs.
C．Large as a house.
D．More than one kilogram.
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