单项选择题

I don' t understand why people ______ such a beautiful garden with cans and bottles.

A．located
B．provided
C．protected
D．littered
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单项选择题
The two newspapers gave different ______ of what happened.
A．versions
B．editions
C．productions
D．texts
单项选择题
The degree of economic growth is an ______ of the level of living.
A．index
B．advantage
C．access
D．aspect
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