burn——青夏教育精英家教网—

摘要： burn

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People burn a lot of young trees every year.(句型转换)

A lot of young trees________ ________ every year.

People burn a lot of young trees every year.(句型转换)

A lot of young trees________ ________ every year.

If H2 burn in O2, we can get _____.

If H2 burn in O2, we can get _____.

If H2 burn in O2, we can get _____.

A．H2 B．H2O C．O2 D．H2O2

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