单项选择题

A．Do her homework.
B．Wash clothes.
C．Clean the backyard.
D．Enjoy the beautiful day.
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单项选择题
To avoid the mistakes of our forefathers, the author suggests that ___________________.
A．we plant more trees
B．we return to nature
C．natural sciences be taught to everybody
D．environmental education be directed to everyone
单项选择题
I
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