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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

Wearing white can help people _______when they feel stressed.

He is ____ how to raise money for the Hope Project these days.

About fifty percent of the hall ________ a training centre.

There is only ________juice in the fridge. Let's go shopping.

— There're more and more foreigners living in China.

— That's true. ____ the delicious food ____ the safe environment is their favorite.

When they heard the sound of the fire engine, they all rushed out!

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