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【多选题】
幼儿园环境舒适度对空气的要求是( )A.
清洁无污染
B.
注意保持室内空气疏通
C.
有足够的花草树木
D.
有空气净化器
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【简答题】排气温度传感器用来检测（）；用以判断（）。
【单选题】Today, the forests have almost gone. People must ______ down too many trees.
A.
stop from cutting
B.
be stopped to cut
C.
be stopped from cutting
【单选题】Today, the new forests along the Hah River play an important role in regulating the region's climate.
A.
Y
B.
N
C.
NG
【简答题】In 1620, about half the USA was covered by forests． Today the forests have almost gone． A lot of good land has gone with them, leaving only sand． China doesn’t want to copy the USA’s example． We’re pl...