问题 单项选择题

病毒能否吸附易感细胞的决定因素是()

A.病毒包膜

B.核酸

C.刺突

D.壳粒及排列

E.病毒表面的配体位点和敏感细胞表面的特异性受体

答案

参考答案:E

阅读理解

阅读理解。阅读短文,回答下列问题。

  Some countries are better than others at looking after the environment. In

Europe, Germany (德国) and northern European countries work very hard to

improve the environment. The people in Germany put their rubbish into different

bags-paper in one bag, plastic in another bag, etc. Therub- bish is then taken

away and, if possible, recycled(回收) There are laws that do not allow people

to burn too much coal.

       In the 1970s, as people learned more about environmental problems,  the

"Green" movement  (运动) began and soon spread all over Europe. The "Green"

movement tries to get governments to protect the environment. It collects

information about how industry is damaging (破坏) the environment and tells

newspapers.

1. Which countries in Europe work very hard to improve the environment ?

                                                             

2. Who put rubbish into different bags?

                                                             

3. Can the people in Germany burn too much coal?

                                                             

4. When did the "Greenv"movement begin?

                                                             

5. What does the "Green" movement try to do?

                                                            

填空题