单项选择题

A．How deep they are.
B．Where earthquakes form.
C．How hot they are.
D．What purpose they serve.
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单项选择题
According to the author, the universal employment has ______.
A．turned out not to be the best form of jobs
B．created an alternative form of jobs
C．built the foundation of an economic leap
D．failed to produce job opportunities for most people
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