— Why do many people buy things online?

— Because most of them are on sale. The price is much ________.

A.cheaper B.lower C.higher

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Some of you may play Ant Forest. It is a game on Ali pay. Users collect "energy" to make their "trees" grow. When the "energy" reaches a certain level (程度), some organizations and companies will plant a real tree in a desert area of China. And now it seems that the country's efforts as a whole to make a greener world have paid off.

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