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
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
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
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