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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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.
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