问题 选择题

观察如图眼睛结构模式图,看看下列有关叙述中有无错误,若有,请把错误的选项找出来(  )

A.眼球壁的中膜是由图中的1、2、7共同组成的

B.图中的8上有感光细胞,能感受光线的刺激

C.当人从明处到暗处时,图中的3会缩小

D.图中4的曲度是由1中的平滑肌调节的

答案

眼球的结构包括眼球壁和内容物.眼球壁包括外膜、中膜、内膜三部分.

A、眼球壁的中膜包括2虹膜、1睫状体、7脉络膜,故此选项是正确的;

B、图中的8是视网膜.上面有感光细胞,接受物像的刺激能够产生神经冲动,故此选项正确;

C、2虹膜能够调节3瞳孔的大小.当人体进入暗处时,瞳孔开大肌收缩,瞳孔变大,使更多的光线进入眼球;当光线太强时,瞳孔括约肌收缩,瞳孔变小,减少光线的进入.故此选项错误;

D、图中的4是晶状体,受1睫状体内的平滑肌控制的.当睫状体收缩时,晶状体的凸度变大,可以视近物;当睫状体舒张时,晶状体的凸度变小,可以视远物.此选项正确.

故选:C

阅读理解

Tips for avoiding traffic jams:

The radio has more than just music. Check the local news station for the latest traffic report. Or go online and check traffic cameras before you set out. If there is a jam, you'll be prepared and can try another route.

Take the road less traveled. Although highways may be the most direct route, back (偏僻的) roads can be much less crowded, which can save you from the frustration of the stop-and-go traffic.

Rush hour isn't just a lovely nickname. It means the morning and afternoon traffic lasts for several hours, but they're still called "rush hour" for a reason - everyone's on the road and in a hurry to get somewhere. Treat rush hour like bad weather - if you don't have to go anywhere, stay off the roads.

Tips for those unavoidable traffic jams:

Don't break the law. You've gone 30 feet in 30 minutes and all of a sudden you see people using the shoulders(紧急停车道). Don't behave like them. Not only is this illegal, but also there's a good  chance they'll get caught or cause even more problems.

Pay extra attention to zig-zaggers (Z字形行进者). When some people are anxious, they may start changing lanes(车道)every 5 seconds or cut you off, Keep checking your windows and mirrors. for these lane changers.

Look for an escape. If it is possible to exit the road safely, do it. Use a GPS unit, and you can change your route mid-trip if needed.

Be courteous. Good manners could help you avoid a possible accident. Allow people in from a lane that is ending. Speeding up to keep them out increases your chances of an accident.

小题1:To avoid traffic jams,we are advised to do the following EXCEPT_______.

A.get traffic news before leaving

B.choose back roads.

C.avoid rush hours.

D.change lanes frequently.小题2:What should we do when there are zig-zaggers?

A.Keep checking the mirrors

B.Stop and let them go first

C.Sound the hom loudly.

D.Drive quickly to keep them out小题3:What does the underlined word “courteous”in the last paragraph mean?

A.Energetic

B.Polite

C.Careful

D.Honest小题4:In which part of a magazine can this passage be found?

A.Entertainment

B.Market

C.Life

D.Advertisement

单项选择题