单项选择题

Man's attitude toward scientific discoveries has always been ______.

A．suspicious
B．undoubting
C．cynical
D．critical
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单项选择题
The writer's main purpose in writing this passage is to say that ______.
A．science has greatly improved man's life
B．science is far from perfect in exploration of the world
C．science has reached its climax in many fields
D．science has done too little to human beings
单项选择题
What was hailed as a biological revolution thirty years ago
A．Discovery of the structure of DNA
B．The decoding of the linear language
C．The mechanical device found in the human cell
D．The unbelievable complexity of DNA
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