[单项选择]大多数药物通过生物膜的转运方式为
A. 被动扩散
B. 主动转运
C. 促进扩散
D. 胞饮作用
E. 吞噬作用

What We Can Learn from Lei Feng
Lei Feng, a name known to almost each Chinese, has been a symbol of helpfulness since the AIF0s. Although he died quite young，he devoted his short life to doing countless good deeds. His behavior embodies many of our traditional virtues.
There are many things we can learn from him, such as patriotism, generosity, nobleness and deep love for ordinary people. Whatever job Lei Fei was assigned to, he would endeavor to do it well. The most important quality we should learn from him is the willingness to help those in need in our daily lives.
In contemporary China, people are getting increasingly money-minded. It is not uncommon for people to think of everything in terms of money. If all of us can take Lei Feng as a role model, we can help create a society of mutual care, where one’s value is judged by the contributions made to society. In this case, it won’t be long before China becomes a country in which more people will behave as Lei Feng did.