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
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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
单项选择题
The passage suggests that learning to speak and learning to fide a bicycle ______.
A．provide essential skills for learning to grow
B．need a lot of teaching and correction
C．are similar in that they are learnt by practicing and making changes
D．are quite different in the way they are picked up naturally
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