单项选择题

A．Running and thinking.
B．Running and jumping.
C．Running and climbing.
D．Running and skiing.
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单项选择题
A．They axe twins.B．They axe classmates.C．They are friends.D．They are colleagues.
A．They axe twins.
B．They axe classmates.
C．They are friends.
D．They are colleagues.
单项选择题
It can be concluded from the passage that______.
A．rubbish is a potential remedy for the shortage of raw materials
B．local governments in the U. S. can expect big profits from recycling
C．recycling is to be recommended both economically and environmentally
D．landfills will still be widely used for waste disposal
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