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 can best describe the author's tone
A．Pessimistic.
B．Cheerful.
C．Excited.
D．Optimistic.
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