单项选择题

The most urgent problem that still remains unsolved, however, is how to stop water from wasting.

A．然而，仍然没有得到解决的最紧迫的问题是怎样阻止水的浪费。
B．但是，最紧迫的还没有得到解决的问题是怎样阻止水的浪费。
C．然而，仍然没有得到解决的最紧迫的问题是怎么停止水的浪费。
D．最紧迫的问题还没有解决，但是，又怎么能停止水的浪费。
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单项选择题
The passage tells us______.
A．some new cities have been built under tile ground
B．it’ll be difficult to build the new cities under the ground
C．people will spend much money building new cities under the ground
D．both B and C
单项选择题
Male’s heart power to pump blood around the body could have decreased by ______of its youthful strength.
A．1/2
B．1/3
C．1/4
D．1/5
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