单项选择题

（）scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

A．As
B．While
C．For
D．Since

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单项选择题
I had worked here （）you came here. But l shall leave for England（）.

A．before long; before long
B．before long; long before
C．long before; before long
D．long before; long before
单项选择题
The population of China is （）the United States.

A．much larger than that of
B．moremore larger than that of
C．much larger than
D．moremore larger than
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