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简介：
一、单选题
1．—What should we do to keep the air clean? ( )
—__________.
A．We should ride bike more often
B．We can go for a walk
C．We need to walk
2．Lu Ban was ___________ work on a mountain. ( )
A．at B．on C．in
3．Ben and his family spent their holiday in London. They visited ______ today. ( )
A．the Great Wall
B．the Palace Museum
C．the British Museum
4．My father and I _______ like playing chess. ( )
A．all B．both C．with
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