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题型：单选题题类：真题难易度：困难

The exhibition tells us ______ we should do something to stop air pollution.

A、where B、why C、what D、which

举一反三

Jim didn't understand ________.

We promise attends the party a chance to have a photo taken with the movie star.

The same boiling water softens the potato and hardens the egg. It's about you're made of, not the circumstances.

Our bad living habits will destroy the earth. Only by changing ________ we live can we save the earth.

You should keep those old jam bottles—you never know ________ you might need them.

As an {#blank#}1{#/blank#}(educate), people often ask me {#blank#}2{#/blank#} I know what is going on in the {#blank#}3{#/blank#}(mind) of my students.

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