单项选择题

Behaviorism basically believes in _________.

A．motivation
B．performance
C．rewards
D．human factors
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单项选择题
Now scientists have found in the past few years _________.
A．the exposure of DNA to the public is unnecessary
B．the tiny cell in DNA is a neat little machine
C．man knows nothing about DNA
D．man has much to learn about DNA
单项选择题
The writer’s main purpose in writing the passage is to say that _________.
A．science is just at its beginning
B．science has greatly improved man’s life
C．science has made profound progress
D．science has done too little to human beings
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