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 （）of the scientific attitude is that the human mind can succeed in understanding the universe.

A．essence
B．content
C．texture
D．threshold
单项选择题
If nothing is done to protect the environment, millions of species that are alive today will have become （）

A．deteriorated
B．degenerated
C．suppressed
D．extinct
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