单项选择题

What is the size of the piece of Telstar X 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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A．at a lossB．at lastC．in groupD．on the occasion
A．at a loss
B．at last
C．in group
D．on the occasion
单项选择题
Cuba accuses______ government of supporting the dissidents.
A．US
B．Canadian
C．British
D．Russian
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