单项选择题

The writer' s attitude towards science is ______.

A．critical
B．approving
C．neutral
D．regretful
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单项选择题
The principle discovery in this century shows ______.
A．man has overthrown Newton' s laws of physics
B．man has solved a new set of gigantic puzzles
C．man has lost many scientific discoveries
D．man has given up some of the once accepted theories
单项选择题
The author mentions all of the following as possible prod nets of crude oil EXCEPT ______.
A．gasoline
B．kerosene
C．wax
D．plastic
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