问题 问答题 简答题

昆虫对各类杀虫剂涉及的主要生理生化抗性机理有哪几个方面?

答案

参考答案:

简单地说,昆虫对各类杀虫剂涉及的主要生理生化抗性机理有以下几个方面:

(1)穿透速率降低。包括两种类型:一是杀虫剂穿透昆虫表皮的速率降低,二是杀虫剂对神经系统穿透作用降低;

(2)代谢抗性:涉及到的酶有,细胞色素P450酶系、水解酶(主要是酯酶)、谷胱甘肽转移酶、DDT-脱氯化氢酶等;

(3)靶标部位敏感度降低等。

完形填空
Mr. Black loved his daughter Helen very much. Every day he spent all of his free time     36   with her. One night, when he     37   his house, Helen came running to him and was ready to play. But he had a lot of work to do,     38    couldn’t play with his daughter. In order to keep her     39   , he found a map of the world in a magazine and cut it into pieces. Mr. Black said he had     40    time to play right now. He told the girl to put the pieces of paper back together to make up a map of the world, and then they could both play.
About half an hour later, Helen came to her father and said, “Okay, it’s finished. Can we play now?” Mr. Black was surprised, he said, “That’s     41   . Let’s go and see.” And sure enough, there was the picture of the world; all put together, every    42     in its place. Mr. Black said, “That’s surprising!    43    did you do that?” Helen said, “It was    44   . On the back of the paper was a picture of a    45   .When I put the man together, the whole world fell into place.”
小题1:
A.workingB.runningC.playingD.walking
小题2:
A.got backB.got toC.got onD.got out
小题3:
A.orB.andC.butD.then
小题4:
A.sleepyB.warm C.freeD.busy
小题5:
A.noB.enoughC.muchD.some
小题6:
A.rightB.wrongC.possibleD.impossible
小题7:
A.mapB.pictureC.pieceD.page
小题8:
A.HowB.WhyC.WhenD.Where
小题9:
A.hardB.simpleC.difficultD.different
小题10:
A.boyB.girlC.manD.woman
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