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【单选题】
关于实验室制取乙烯的说法不正确的是（ ）A.
温度计插入到反应物液面以下
B.
加热时要注意使温度缓慢上升到170 ℃
C.
反应过程中溶液的颜色会逐渐变黑
D.
生成的乙烯中混有有刺激性气味的气体
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举一反三
【单选题】Many things can ______ the earth, for example, car fumes and garbage.
A.
recycles
B.
produce
C.
harm
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