单项选择题

A．All the rivers used to be very dirty.
B．About one in three of the rivers are polluted.
C．All the rivers are unsafe and smelly.
D．Kids will go to the river bank to cam.
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单项选择题
Which .of the following statements in NOT true according to the passage
A．Energy will be more expensive and in short supply.
B．Most people will be on their legs.
C．The air will be cleaner in 1997.
D．There will be more cars than ever in.1997.
单项选择题
Why will American need to export food in 1997
A．Because the farmers will need a lot of money.
B．Because it will need money to buy oil.
C．Because it will have too much food for its own use.
D．Because it wants to help other countries.
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