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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单项选择题
That Africa and South America were once joined can be deduced front the fact that ______.
A．the two continents are still moving in opposite directions
B．they have been found to share certain geological features
C．the African plates has been stable for 30 million years
D．over 100 hot spots are scattered all around the globe
单项选择题
The author believes that ______.
A．the motion of the plates corresponds to that of the earth's interior
B．the geological theory about drifting plates has been proved to be truse
C．the hot spots and the plates move slowly in opposite directions
D．the movement of hot spots proves the continents are moving apart
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