问题 单项选择题

疟疾的周期性发作,其间歇期的长短取决于()

A.感染性子孢子进入人体血循环的数量

B.子孢子在肝细胞内发育成裂殖体的时间

C.裂殖体在红细胞内发育成熟的时间

D.裂殖子在红细胞内的数量

E.疟疾虫毒力强弱

答案

参考答案:C

解析:主要考核学生对疟疾病原学的认识。预测错误率较高。常见错误:①选答A"感染性子孢子进入人体血液循环的数量"可能与病情程度有关;②选答"B","子孢子在肝细胞内发育成裂殖体的时间"与疟疾复发有关。要点疟疾的周期性发作,其间歇期的长短取决于裂殖体在RBC内发育成熟的时间。

单项选择题 A3型题
单项选择题

Passage Two

One hot night last July,when our new baby wouldn’t or couhln’t sleep, I tried everything I could think of:a warm bottle, songs, gentle rocking. Nothing would settle him. Guessing that I had a long night ahead of me, I brought a portable TV into his room,figuring that watching the late movie was as good a way as any to kill of the hours till dawn. To my surprise, as soon as the TV lit up, the baby quieted right down, his little eyes focused brightly on the tube. Not to waste an opportunity for sleep, I then tiptoes out of the room,leaving him to watch the actors celebrate John Bellushi’s forty-fifth birthday.

My wife and I heard none of the baby that night, and the next morning when I went into his room, I found him still watching TV himself.

I found in my baby’s behavior a symbol of the new generation. My wife and I had given him some books to examine, but he merely spit upon them. When we read to him, he did not feel comfortable. And so it is in the schools. We find that our students don’t read and they look down upon reading and scold those of us who teach it. All they want to do is watch TV. After this experience with the baby, however, I have reached a conclusion : "Let them watch it ! "If television is that much more attractive to children than books,why should we fight about it Let them watch it all they want!

Why did the author bring a TV set into his son’s room()

A.To make his son keep quiet.

B.To spend the night by watching TV programs.

C.In order not to let his son feel lonely.

D.To make his son go to sleep as soon as possibl