单项选择题
The author thinks of advertisements as ______.
A．convincing
B．instructive
C．influential
D．authoritative
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单项选择题
The author’s purpose in writing this passage is to tell ______.
A．readers how to be popular with around
B．teenagers how to learn to decide things for themselves
C．parents how to control and guide their children
D．people how to understand and respect each other
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单项选择题
A lot of cities are trying new ways to treat garbage mainly because ______.
A．their environment is becoming more and more dirty
B．the traditional ways of treating wastes are not efficient
C．they are short of useful materials
D．they need new materials made from garbage
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