单项选择题

The negative effect of engineering solution is that ______.

A．it costs a large amount of money which is not affordable
B．the government worries about the quality of the water conservancy
C．it destroys the habitat of plants and animals of that area
D．the government becomes more and more ignorant

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单项选择题

It can be inferred from the passage that ______.

A．if dams were built in river basins, the downstream ecology remained the same
B．governments have to be responsible for the changes caused by the constructions of dams
C．the results of controlling water flows by engineers can be well forecasted
D．a dam can bring economical advantages for almost a century

单项选择题

Companies don't want to spend money on research in developing appropriate crops in Africa because ______.

A．existing technology fails to grow dry-land crops
B．only dozens of years later can they make profits
C．they are not encouraged and probably cannot make any profit
D．most of African countries belong to the third world