嘌呤核苷酸从头合成时先合成的前体正确的是（） A.AMP B.ADP C.GMP D

（2005全国卷, 21）--–Can I speak to Mr Wang, please?        

--________.

A．Who are you ?

B．I’m Wang

C．Speaking

D．Are you Zhang

阅读理解。

     Each term. Andrew Tom receives a term bill, tuition (学费), student center recreation fee, resident activity

fee, health insurance. If only the rest of his expenses were as easy to quantify (确定数量).

     "It' s like you start out the term With plenty of money and then $ 20 for dinner out here and $100 at the

department store there, it' s gone," said Tom, a third-year student."And there are so many daily necessary

things that you don' t think about until you get there and need it."

     From the books to the fashionable clothes, college students say~ the expenses of a college education go

well beyond tuition and a dining hail meal plan. Many say they arrive on campus only to be frightened by

unexpected costs from sports fees to the actual price of a slice of pizza.

     Balancing a job with schoolwork, especially at colleges known for their heavy workloads like Harvard and

MIT, can be tough. So can the pressure that students of- ten feel in order to financially go along with their

friends.

     "When you get dragged along shopping, you're going to spend money; if you, get dragged to a party and

everyone wants to take a taxi but you are cheap and wantto take a bus, chances are you' 11 end up sharing

the fee for the taxi," said Tom."Iguess you could say no, but no one wants to be the only one eating in the

snack bar while our friends are out to dinner."

      Max Cohen, a biology major at MIT, said he is used to watching fellow students spend $ 40 a night to

have dinner delivered or $ 50 during a night out at a bar. During the school' s recent spring break, friends on

trips for the week posted away messages that read like a world map-Paris, Rome, Tokyo."Meanwhile I

stay at home and work," said Cohen."I didn't realize when I came here how much money I would spend or

how hard I would have to work to get by."

     It is a lesson some younger students learn quickly. Others, surrounded by credit card offers, go into debt,

or worse, are forced to leave school. 

     "A lot of people don' t think twice about how much they spend," said a first year student at M1T,"and you

feel the pressure sometimes to go along with them."

1. What do we learn from the first two paragraphs?

A. The tuition in the college is very high.

B. Andrew Tom should reduce the budget (预算).

C. It' s easy to quantify how much will be spent each term.

D. The cost of college education is much higher than expected.

2. The underlined word "cheap" in Paragraph 5 means _______.

A. inexpensive

B. unwilling to spend money

C. valueless

D. low in price and quality

3. What can be inferred from the passage?

A. Students have to work hard to pay their tuition.

B. Most students have heavy loads in their studies.

C. Many students are under great financial pressure.

D. Students depend on their families for all the expenses.

4. According to the writer, what causes the high costs for college students?

A. Lack of budget.

B. The school' s overcharging.

C. The high prices of daily necessary things.

D. Financially going along with each other.

如图给出的各种现象中，物体动能发生改变的是（　）

A．运动员把飞来的足球踢出去

B．小孩匀速从滑梯滑下

C．核外电子绕原子核匀速转动

D．刚刚起飞的火箭

电信现网的2发4收基站可以支持的RANK（秩）最大值为4。

处理筒体煤多的方法是：减小给煤或停止给煤机，增加通风量，严重时停止磨煤机或打开人孔盖清除堵煤。