单项选择题

A．value
B．ratio
C．rate
D．speed
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单项选择题
A．It would bum on reentry to the earth’s atmosphere.B．It would collide with aircraft on reentry.C．It might cause considerable damage.D．It will not survive its atmosphere descent.
A．It would bum on reentry to the earth’s atmosphere.
B．It would collide with aircraft on reentry.
C．It might cause considerable damage.
D．It will not survive its atmosphere descent.
单项选择题
A．From lightning.B．By rubbing sticks of wood.C．From a dead tree.D．By banging rocks.
A．From lightning.
B．By rubbing sticks of wood.
C．From a dead tree.
D．By banging rocks.
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