下列有机物属于烃的是（ ）
A．C2H5OH
B．CCl4
C．C2H6
D．CH3COOH
答案：C
烃由碳氢构成，AD有氧，错误。B为烃的衍生物。
Owing to environment pollution, a number of insects have ________. [ ]
A. died out
B. put out
C. brought out
D. picked out
污染物形态
