狂犬病毒固定毒株的特点是A．自然感染能侵犯中枢神经系统 B．自然感染不能侵犯中枢神经
题型：多项选择题
问题：
狂犬病毒固定毒株的特点是
A．自然感染能侵犯中枢神经系统
B．自然感染不能侵犯中枢神经系统
C．毒力增强
D．毒力减弱
E．具有免疫原性
题型：多项选择题
阅读理解
When you leave school, you_can_breathe_a_sigh_of_relief_and_leave_learning_behind, right?
Wrong! Learning should last a lifetime. You exercise your body to stay strong, and you should exercise
your mind to stay sharp.
An English idiom says, "You can't teach an old dog new tricks." But scientists have discovered that
isn't true. Older people can learn, and they should, in order to keep their brain active. Now a new trend
has begun in several states in the US that encourages learning. Adults can attend One Day University.
They can spend a Saturday or Sunday hearing four 70－minute lectures. Each one is given by a top
university professor. One of the original participants said, "It's like a health club for the brain." Also,
universities like MIT have made all of their courses and lectures available online for free! Libraries offer
learning programs too. With so much available, there is no excuse not to learn!
Learning is a habit.Don't leave it behind after you leave school. On the website lifehack.org, author
Scott Young mentions several things to help you.
Always have a book. It doesn't matter if you read fast or slow. Just read.If you read just one book a
week, you'll read 52 over the course of a year. Think of the knowledge you'll gain!
Practice it. As you read, do something with what you've learned. Don't just enjoy the mental exercise.
Use the knowledge. If you read about painting, try it!
Make a "to learn" list. Compose a "to learn" list for yourself. Maybe you want to speak better English, play the piano, or cook French food. Whatever interests you, put it on your list and then make the time to do it. Teach others. Whatever you learn, teach someone else. You'll not only help others but also
understand what you've learned.
1. What's the best title for this passage?
A. Make learning last a lifetime.
B. What you should do after leaving school.
C. Several tips on learning.
D. A new trend in learning.
2. What does the underlined part in Paragraph 1 mean?
A. You don't need to consider what you have learnt after graduation.
B. Leaving learning behind is what you should do after a break.
C. You can relax as you have escaped from the hard life of studying.
D. You should have a good rest and then go on learning.
3. How many ways of learning for adults in the US are mentioned in Paragraph 2?
A. One.
B. Two.
C. Three.
D. Four.
4. Which of the following is NOT a suggestion made by Scott Young in the passage?
A. Keep learning as a habit.
B. Always have a book.
C. List what you want to learn.
D. Teach others what you learn.
5. From the passage we learn that________.
A. we should read as fast as possible to gain more knowledge
B. we should use the knowledge we have gained from books
C. we can gain every kind of knowledge through books
D. the main purpose of gaining knowledge is to teach others