问题 单项选择题 A1/A2型题

下列组织中呈现嗜银性的是()。

A.胶原纤维

B.弹力纤维

C.网状纤维

D.肌纤维

E.神经胶质纤维

答案

参考答案:C

解析:网状纤维用银氨溶液浸染能使纤维变成黑色,故又称为浸银纤维。其染色的基本原理是由于组织蛋白质与银化合物结合,再经过甲醛还原成为金属银而沉淀于组织内及表面。

阅读理解

Do you know what couch-potato means? Well, in America, the word is now often used. You see, in America, many people often spend their free time sitting on a couch (沙发) watching TV. As there are many channels (频道) to choose, the TV can be quite interesting and very addictive (使人上瘾的). One may sit and watch TV for hours and hours without stop! Well, these people who do nothing all day except watch TV are called couch-potatoes.

In America, while watching TV, most often sitting still with eyes looking right into the TV set. Also because these people are addictive to TV, they don’t take exercise and usually get very fat. So in many ways, these people look like real potatoes! Well, because they look fat, and watch TV on a couch, they are all called couch-potatoes. Now you know what a couch-potato means. The next time if you see someone watching TV too long, just say, “What a couch-potato!”

小题1:The word “couch-potato” is often used in ______.

A.China

B.France

C.America

D.Germany小题2:If a person is called a couch-potato, he or she ______.

A.does nothing all day

B.often listens to music

C.often watches TV in his free time

D.must be very fat小题3:Why does a couch-potato look like a real potato?  Because he or she ______.

A.is fat and cannot take exercise

B.is fat and round

C.likes eating potatoes on a couch while watching TV

D.almost never moves while watching TV and gets fat小题4:The passage mainly (主要) tells us ______ .

A.how to watch TV

B.what couch-potato means

C.why couch-potatoes are very fat

D.where you can find couch-potatoes

判断题