单项选择题

A．many
B．much
C．heavy
D．weighted
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单项选择题
A．lineB．layerC．bottomD．point
A．line
B．layer
C．bottom
D．point
单项选择题
The African plate is stationary and that it has not moved during ______ years.
A．the past 30 million
B．the past 40 million
C．the past 50 million
D．the past 10 million
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