单项选择题

The old lady has developed a ______ cough which cannot be cured completely in a short time.

A．perpetual
B．permanent
C．chronic
D．sustained
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单项选择题
The wedding ring is a symbol of love, because a circle has no beginning or end.
A．eternal
B．external
C．internal
D．interval
单项选择题
It can be inferred from the passage that ______
A．if dams were built in river basins, the downstream ecology were 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
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