问题 单项选择题 A1型题

关于高频振荡通气,下列说法错误的是()

A.是一种以高频率、低潮气量、低气道压为特点的通气方式

B.气囊漏气有助于降低PaCO2

C.吸气是主动的,呼气是被动的

D.振荡频率可达300~3000次/分

E.可产生正弦波振荡

答案

参考答案:C

解析:高频振荡通气是一种以高频率、低潮气量、低气道压为特点的通气方式,不同于高频正压通气和高频喷射通气,其吸气和呼气相均是主动的,即吸气时气体被送入肺内,呼气时由呼吸机主动将气体吸出。振荡频率可达300~3000次/分,不仅频率高,而且产生正弦波振荡形式。气囊漏气、降低呼吸频率、增加吸呼比等有助于降低PaCO2

选择题
阅读理解

Baby girls make their way directly for dolls as soon as they can crawl, while boys will head for the toy cars,  a study has shown. The findings, the first to show differences in very young babies, suggest there is a biological basis to their preferences.

Psychologists Dr Brenda Todd from City University London carried out an experiment involving 90 infants aged nine months to 36 months. The babies were allowed to choose from seven toys. Some were stereotypically boys' toys - a car, a digger, a ball and a blue teddy.  The rest were girls’ toys: a pink teddy, a doll and a cooking set. They were placed a meter away from the toys, and could pick whichever toy they liked. Their choice and the amount of time they spent playing with each toy were recorded.

Of the youngest children (nine to 14 months), girls spent significantly longer playing with the doll than boys, and boys spent much more time with the car and ball than the girls did. Among the two-and three-year-olds, girls spent 50 percent of the time playing with the doll while only two boys briefly touched it. The boys spent almost 90 percent of their time playing with cars, which the girls barely touched. There was no link between the parents’ view on which toys were more appropriate for boys or girls, and the children’s choice.

Dr Brenda Todd said: “Children of this age are already exposed to much socialization. Boys may be given ‘toys that go’ while girls get toys they can care for, which may help shape their preference. But these findings agree with the former idea that children show natural interests in particular kinds of toys. There could be a biological basis for their choices. Males through evolution have been adapted to prefer moving objects, probably through hunting instincts(本能), while girls prefer warmer colors such as pink, the color of a newborn baby.”

小题1:Baby boys and girls have different toy preferences probably because         .

A.baby boys are much more active

B.baby girls like bright colors more

C.their parents treat them differently

D.there is a natural difference between them小题2:What can we infer from Paragraph 3 ?

A.Nine-month-old baby boys don’t play with dolls at all.

B.Two-year-old baby girls sometimes play with cars and balls.

C.The older the babies are, the more obvious their preference is.

D.Parents should teach their babies to share each other’s toys.小题3:What conclusion did Dr. Brenda Todd draw from the results of the study?

A.Adults purposely influence their babies preference.

B.Babies’ preference isn’t affected by social surroundings.

C.Baby boys preferring to moving toys will be good at hunting.

D.Baby girls preferring warmer colors will be warm-hearted.小题4:We may read this article in a        section of a newspaper.

A.science

B.health

C.education

D.entertainment