问题 单项选择题 A1型题

再生障碍性贫血的发生机制是()

A.造血原料缺乏

B.骨髓造血功能低下

C.急性失血

D.严重感染

E.红细胞破坏

答案

参考答案:B

解析:再生障碍性贫血由于多种原因导致骨髓造血功能衰竭,以骨髓造血干细胞及造血微环境损伤、外周血全血细胞减少为特征。【该题针对“贫血”知识点进行考核】

完形填空

Read the passage and fill in the blanks with proper words. (14分)

You know that eating a sensible diet and getting plenty of exercise help make your body healthy and strong. But do you know that there are ways to make your brain healthier and smarter? Here are seven steps toward a smarter brain.

Limit your TV viewing

Never spend too much time on TV viewing, for it n__小题1:__ very little brain activities. Your brain will become weak just as your muscles do. If you do watch TV, choose something educational and meaningful.

Travel

Travelling to a____小题2:__ country forces you to see and do things in a fresh way, bringing stimulation to the brain. Learn a new language

Learning a new language involves different learning methods. Learning a language sharpens your brain and helps prevent memory p___小题3:___ that you may meet in later years.

Read often

As you read, take the time to look up people or places that aren’t familiar. Reading makes your vocabulary much l___小题4:__ if you always search for words and definitions that you don’t know. Each week, choose an animal, a bird or fish, and read everything you can about it. Stretch your brain as you become an expert on the subject.

Calculate w_____小题5:___ you shop

As you put things in your grocery cart, total everything in your head. See how close you get to the actual total.

Use your non-dominant(不占优势的)hand

If you are right-handed, use your left hand for everyday activities, or use your right hand if you are left-handed. Doing familiar things in a different way will make your brain c____小题6:__ new neural (神经)networks.

Wechat(微信)!

Read messages from people who has different interests. And some say that learning to express y____小题7:___ in just 100 words is a great brain challenge.

Have a try and do these every day. Little by little you can get into the habit of challenging your brain, and make your brain smarter!

单项选择题