These days, people ________ many trees, so we don’t have much clean air now.

A. cut down B. come true C. have to D. get to

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Frogs are animals that can live not only in water but also on land. There are about 5,000 kinds of frogs on the earth. The earliest frogs lived about 190 million years ago and the frogs today still look the same. Here are some fun things that frogs.

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