单项选择题

What can the tree’s rings tell us（）

A．The age of the tree.
B．The changing activities of sun.
C．A lot more.
D．All the above.

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单项选择题
What does the passage tell us about American rivers
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.
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.
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