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

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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
单项选择题
No one imagined that the apparently （）businessman was really a criminal.

A．respective
B．respectable
C．respectful
D．realistic
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