单项选择题

The environmental balance among ecological communities is exceedingly complex.

A．almost
B．successfully
C．extremely
D．rarely
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单项选择题
Psychologists have recently mounted an offensive against what they describe as nastiness toward students by educators.
A．arbitrariness
B．unpleasantness
C．severity
D．aloofness
单项选择题
In the first decades of the twentieth century, the individual gene could not be seen, but could be worked with fruitfully.
A．blindly
B．completely
C．productively
D．carefully
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