足球以8m/s的速度飞来，运动员把它以12m/s的速度反向踢出，踢球时间为0．2s，

识别抗原，并把识别信号传递到T细胞内的是（）

A.TCR-CD3复合物

B.mIg

C.FcR

D.C3bR

E.BCR复合物

有以下程序　　main(　)　　{　int a; char c=10;　　　float f=100.0; double x;　　　a=f/=c*=(x=6.5);　　　printf("%d %d %3.1f %3.1f\n",a,c,f,x); }　　程序运行后的输出结果是（ ）。

A．1 65 1 6.5

B．1 65 1.5 6.5

C．1 65 1.0 6.5

D．2 65 1.5 6.5

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

春秋战国时期，“士”阶层迅速崛起。“士与一般社会成员的本质区别，就在于他们往往能超越个人经济地位和阶级背景的狭隘限制, 从社会进步、国家兴旺、民众富足的宏观角度和长远目标上思考政治人生。”以下言论不能充分体现该观点的是

A．士有怀居，不足以为士也

B．士可杀不可辱

C．士志于道

D．士不可以不弘毅，任重而道远

可持续增长率是企业收益在未来时期能够达到的最大增长速度。