— Did Tom go to his uncle's?— _____

搜题请搜索小程序“爱下问搜题”

问题选择题

— Did Tom go to his uncle's?
— _____
— I asked whether Tom went to his uncle's.

A. Don't ask me.
B. Pardon?
C. Of course.
D. What happened?

答案

答案：B

选择题

对烷烃中C原子有四种叫法，只和一个C原子相连的C叫伯碳；和两个C原子相连的C叫仲碳；和三个C原子相连的C叫叔碳；和四个C原子相连的C叫季碳。据此判断下列化学式中可能含有季碳的是( )

A．C₃H₈

B．C₄H₁₀

C．C₅H₁₂

D．C₆H₁₄

选择题

下列哪些情况会造成江、河、湖泊水质的污染（　　）

①在水中养殖鱼、虾、鹅、鸭 ②向水中排放造纸废水 ③过量使用农药、化肥 ④江河奔流冲刷沿岸土壤、岩石 ⑤生活污水流入江、河、湖中．

A．①②③

B．①②③④⑤

C．①②③⑤

D．②③⑤