问题
单项选择题 A1/A2型题
农药六六六中,药效最高的异构体是()
A.甲体
B.乙体
C.丙体
D.丁体
E.甲体和乙体
答案
参考答案:C
解析:有8种同分异构体,分别称为α、β、γ、δ、ε、η、θ和ξ,其中α-、β-、γ-、δ-六六六又被称为甲体、乙体、丙体和丁体六六六,其中γ异构体杀虫效力最高,α异构体次之,δ异构体又次之,β异构体效率极低。
农药六六六中,药效最高的异构体是()
A.甲体
B.乙体
C.丙体
D.丁体
E.甲体和乙体
参考答案:C
解析:有8种同分异构体,分别称为α、β、γ、δ、ε、η、θ和ξ,其中α-、β-、γ-、δ-六六六又被称为甲体、乙体、丙体和丁体六六六,其中γ异构体杀虫效力最高,α异构体次之,δ异构体又次之,β异构体效率极低。
补全对话 根据对话内容,从方框中选出适当的选项补全对话( 共4小题,每小题1分,计4分) A: Hi, how was your school trip? B: 小题1: A: Did you go to the zoo? B: No, I didn’t. I went to the aquarium. A: Oh, it must be very interesting. 小题2: B: No, there weren’t any sharks, but there were some really clever seals. A: Wow, that sounds wonderful! 小题3: B: Well, I hung out with my friends and I took lots of photos. A: 小题4: B: Of course. I’ll bring them to school as soon as they come out. A: Thank you.
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