单项选择题

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A.They should cut more trees and not use any materials harmful for human health.
B.They should exploit fast-growing trees and recyclable materials.
C.They should avoid cutting down trees.
D.They should build their houses near the forests so that fresh air is available.
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单项选择题
A.Ozone is an extremely inactive gas.B.Ozone only exists in the upper atmosphere.C.Ground-level ozone is closely related to people’s health.D.Children breathe more air per pound of body weight than adults.
A.Ozone is an extremely inactive gas.
B.Ozone only exists in the upper atmosphere.
C.Ground-level ozone is closely related to people’s health.
D.Children breathe more air per pound of body weight than adults.
单项选择题
A.Ask for some pills to stop it.B.Punish children for their misconduct.C.See the doctor first.D.Dry the beddings as soon as possible.
A.Ask for some pills to stop it.
B.Punish children for their misconduct.
C.See the doctor first.
D.Dry the beddings as soon as possible.
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