The big earthquake is still on.         is badly needed in the mountain villages.

A．Much clothing

B．Lots of suits

C．A good many

D．A lot of clothes

已知CH₃CH=CHCH₃2CH₃CHO，则化学式为C₅H₁₀的烯烃在此条件下可生成醛的种数为 [ ]

A．5

B．4

C．3

D．6