单项选择题

A．However
B．And
C．Therefore
D．So
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单项选择题
A．The pieces would be concentrated in one area.B．The Skylab would not completely bum before reentry.C．There could be considerable property damage.D．Some 400 to’500 pieces survive reentry.
A．The pieces would be concentrated in one area.
B．The Skylab would not completely bum before reentry.
C．There could be considerable property damage.
D．Some 400 to’500 pieces survive reentry.
单项选择题
A．To get warmth and food.B．To fight against enemy in a war.C．To get light and to cook food.D．To attract wild animals.
A．To get warmth and food.
B．To fight against enemy in a war.
C．To get light and to cook food.
D．To attract wild animals.
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