单项选择题

There are notices to the contrary,a great deal of technical writing is at best awkward and at worst actually unclear.

A．denials
B．laws
C．attempts
D．ideas
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单项选择题
The atmosphere,a narrow band of gases surrounding the Earth,is maintained by gravitational pull.
A．clear
B．freezing
C．thin
D．poisonous
单项选择题
Genetics is the study of the biological factors that influence heredity and determine variation in living things.
A．duplicate
B．affect
C．clarify
D．improve
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