单项选择题

A．line
B．layer
C．bottom
D．point
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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
单项选择题
The hot spot theory may prove useful in explaining ______.
A．the structure of the African plates
B．the revival of dead volcanoes
C．the mobility of the continents.
D．the formation of new oceans
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