两个半径相同的金属小球甲和乙，所带电荷量之比为1：2相距r时相互作用力为F．先把

Read the following passage carefully. Then answer the questions or complete the statements in the fewest possible words.

The library is one of the most popular places at a Western university. Students turn to it for research, conversations about class, and many other services.

Compared with Chinese libraries, college libraries in the US and UK tend to offer more resources. A graduate student at Yale University can borrow as many as 225 books at a time.

In addition to borrowing books, there are online and electronic resources. These include a database (数据库) search of popular and academic material, such as LexisNexis Academic, which offers items from newspapers and magazines.

Although books and articles are the items that students ask for most frequently, some libraries provide video recordings. At some schools, teachers and tutors put electronic copies of their teaching PPTs on the library Web to give easier access for students.

Another useful service in Western college libraries is the Interlibrary Loan. This allows a student at one school to borrow books from another school. The loan request is made through the student’s college library, which gets the book, gives it to the user, and arranges for its return.

Technology has made libraries more attractive. Some universities have services for students to send messages through the computer.

Earlier this year, Harvard University introduced a new Scan and Deliver service, allowing students to make requests for parts of books and articles. Requests made through the system are handled by library staff. The student receives an e-mail with an Internet link to the scanned pages. The service is free and all material comes within four days.

It used to be that libraries didn’t allow food or drinks. But that rule is changing and many of them now contain a café so students can spend as much time as they want in the library.

Additionally, some US university libraries are now all-night affairs, or have at least one study room open all night.

(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)

小题1:In comparison with Chinese libraries, college libraries in the US and UK not only_________________.

小题2:According to Paragraph 4 and 5, what are the two useful services for students in Western College libraries?

小题3:The purpose of Harvard University’s introducing a new Scan and Deliver service is to let __________________.

小题4:What have some US university libraries done for a change?

阅读理解

     I just experienced a moment that turned my entire day around. I went to the cafeteria today

to buy my lunch. However, when I entered the line and was ready to take out money, I realized I

forgot to take the purse with me. I dug through different parts of my bag, looking for small

change. After a while, it became clear that, while I found most of the money I had, I was still

short of money to buy my lunch.

     I started looking around for people who may nicely lend me a little change. I thought about all

the time we passed people on the street and said that we didn't have anything to share. Would

that happen to me? I was too hungry to worry about it. Someone would help. I looked for one of

my friends in the cafeteria, but it was too early for any of them to take their lunch yet.

     A very friendly woman appeared in line in front of me. I asked her if she could spare 12 cents.

Instead, she suggested that I put my sandwich in her basket, and anything else I would like to

buy! I told her that I only needed the sandwich, and offered her the change I  had found.

However, she insisted on buying me the dinner.

     A woman joyfully paid for my entire meal and I was grateful. I learned from her that we

should give without expecting anything in turn, even "Thanks".

1. When the author wanted to buy her lunch, she found that _____.

A. she didn't have enough money with her

B. there were too many people in line

C. she had lost her bag somewhere

D. there was no sandwich in the cafeteria

2.According to the passage, a woman _____.

A. jumped the queue

B. bought the dinner for the author

C. lent the author 12 cents

D. asked the author for food

3.The author didn't give up looking for help because _____.

A. she was sure she could find a friend

B. she was very hungry

C. she knew the woman would help

D. she was worried about her purse

甲硝唑最常见的不良反应是（）

A.恶心和口腔金属味

B.腹泻和腹痛

C.头痛和眩晕

D.共济失调和惊厥

E.致癌和致突变

相对而言，下列类型的文件中，不易感染病毒的是______。

A．*.txt

B．*.doc

C．*.com

D．*.exe

血液病病人出血是由于（）、（）、（）3类病因引起。出血部位以（）最常见，以（）出血最严重。