单项选择题

Electrical power is produced by ______.

A．dams
B．reservoirs
C．factories
D．generators
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单项选择题
Cleaners and farmers do ______ scientists do.
A．the same work as
B．less important work than
C．more work than
D．as important work as
单项选择题
From this selection we may conclude that the king's crown ______.
A．moved less water than pure gold of the same size
B．moved more water than pure gold of the same weight
C．moved more water than pure gold of the same size
D．moved less water than pure gold of the same weight
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