单项选择题

______is well-known, the environment in China is badly in need of improvement.

A．It
B．That
C．As
D．What
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单项选择题
Rubber differs from plastics_________ it is produced naturally and not in file.
A．at that
B．in that
C．for that
D．with that
单项选择题
The river here is very wide but_________, so you can walk across it.
A．narrow
B．arrow
C．shallow
D．hollow
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