单项选择题

Fish resources are diminishing because______.

A．no new substitutes can be found in large quantities
B．they are not owned by any particular entity
C．improper methods of fishing have mined the fishing grounds
D．water pollution is extremely serious

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热门试题

单项选择题

The author believes that a successful teacher should be able to______.

A．make study just as easy as play
B．improve students' learning performance
C．make inspired play an integral part of the learning process
D．make dramatization an important aspect of students' learning

单项选择题

One of the reasons why the long-term trend of prices has been downwards is that______.

A．technological innovation can promote social stability
B．political instability will cause consumption to drop
C．new farming and crop technology can lead to overproduction
D．new sources are always becoming available