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题型：单选题题类：真题难易度：普通

Pandas are facing danger！The situation won't change humans stop killing.

A、unless B、though C、if D、after

举一反三

Although he's over 70, he is full of energy.

Hold on to your dreams, _______ they will come true one day.

—I like summer. What about you?
—I don't like summer it is too hot.

— The accompany (陪伴) of parents is very important.

— Yes. _____ parents are busy, they should try to spend more time with their children.

The reason for his success is he worked very hard.

In Yunnan province, there is a valley famous for its butterflies. You will see over four _______kinds of butterflies flying around ________ you get into the valley.

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