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题型：单选题题类：真题难易度：普通

The volunteers many signs to remind people to protect the environment.

A、put on B、put up C、put down D、put off

举一反三

Having ________ exercise every day will do great good to your health.

— all your things, Tim! I hate them here and there.

— OK, mum.

— I like eating chocolate cake very much.

—I think you should eat less because you will put on weight easily.

Eric is a good boy and he never _______ his parents.

The exciting news that Tu Youyou has got the Nobel Prize for Medicine in 2015 ___________ headlines (头条) of all newspapers and websites on Oct.6th.

In Switzerland, a country with high mountains and clean blue lakes, people ____ its rich resources to live.

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