单项选择题

What is the most probable relationship between Tom and Jack

A．They axe twins.
B．They axe classmates.
C．They are friends.
D．They are colleagues.
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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
单项选择题
The key problem in dealing with returned plastic beverage containers is______.
A．to sell them at a profitable price
B．how to mm them into useful things
C．how to reduce their recycling costs
D．to lower the prices for used materials
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