单项选择题

Scientists call on us to()nature and become better recyclers.

A.learn of
B.learn to
C.learn about
D.learn from

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单项选择题

The fridge of the smart kitchen has a scanner and it ().

A．can help you do everything
B．can clean the {ridge when it is dirty
C．can give you a warning when there is something wrong
D．can talk with you

单项选择题

The village where the writer finally decided to settle down ().

A．had more pleasant weather than those in the plains
B．was not far from the river
C．had a great view sight of the plains
D．was at the end of a rough road