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

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单项选择题

The thins brought down by rivers from the mountains that are useful for cultivation are（）.

A．deltas
B．crops
C．fresh water life
D．soil and minerals

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