家蚕发育的过程中，其______与成体的______差异很大，这种发育过程称为变

下列各组中的两个三角形一定全等的是（　　）

A．以100度为内角，10厘米为一边长的两个等腰三角形

B．斜边相等的两个直角三角形

C．有一边相等的两个等腰直角三角形

D．以4、9为边的两个等腰三角形

_ 小题1:  _ One of the best things you can possibly do is to start you own club． It’s great fun especially if you are the sort of person who feels there’s never anything to do during the school holidays．

The first thing you need to come up with is an idea for your club．  _小题2:  _ Pets, clothes, pop music or dancing groups, sports, making things? The list is endless．

Next you need some friends to be in your club with you．  小题3:  _ All you need is three or four other people who are interested in the same thing as you．

 小题4:  You should all sit down somewhere together with lots of pieces of paper and write down every name you can think up． That’ll keep you busy for ages．

At your first meeting you should make up a rule book． And the first rule should be no grown-ups or little/big brothers or sisters! The best clubs are always secret!

Now you have just about everything you need, except membership cards． These are very important and again you can speed a lot of time making them．  小题5:      Why not leave some space for a photo of yourself? That will make the membership card really look like it．

So there you are, get clubbing! Once you get started you’ll think of loads of more interesting things to do!

A． That’s easy．

B． Enjoy your own club!

C． Invite a designer to join you．

D． What are you interest in?E.  Some vacation is just around the corner．

F.  Then you need to pick a name for your club．

G.  Use a bright thick pen to make a special design．

阅读理解。

      Since many of you are planning to study at a college or university in this country, you may be curious to

know what you usually do in a typical week, how you can get along with your fellow students, and so on.

These are the questions I want to discuss with you today.

      First, let's talk about what your weekly schedule will look like. No matter what your major (专业) may

be, you can expect to spend between four and six hours a week for each class attending lectures. Lectures

are usually in very large rooms because some courses such as introduction to sociology or economics often

have as many as two or three hundred students, especially at large universities. In lectures, it's very important

for you to take notes on what the professor says because the information in a lecture is often different from

the information in your text-books. Also, you can expect to have exam questions based on the lectures. So it

isn't enough to just read your textbooks; you have to attend lectures as well. In a typical week you will also

have a couple of hours of discussion for every class you take. The discussion section is a small group meeting

usually with fewer than thirty students where you can ask questions about the lectures, the reading, and the

homework. In large universities, graduate students, called teaching assistants, usually direct discussion sections. 

      If your major is chemistry, or physics, or some other science, you'll also have to spend several hours a

week in the lab, or laboratory, doing experiments. This means that science majors spend more time in the

classroom than non-science majors do. On the other hand, people who major in subjects like literature or

history usually have to read and write more than science majors do.

1. The main purpose of this text is ____. [ ]

A. to help the students to learn about university life

B. to persuade the students to attend lectures

C. to encourage the students to take part in discussions

D. to advise the students to choose proper majors

2. A discussion section does NOT include ____. [ ]

A. working under the guidance of university professors

B. talking over what the students have read about the courses

C. discussing the problems related to the students' homework

D. raising questions about what a professor has said in a lecture

3. A discussion section does NOT include ____. [ ]

A. working under the guidance of university professors

B. talking over what the students have read about the courses

C. discussing the problems related to the students' homework

D. raising questions about what a professor has said in a lecture

4. According to the author, science majors ____. [ ]

A. have to work harder than non-science majors

B. spend less time on their studies than non science majors

C. consider experiments more important than discussions

D. read and write less than non-science majors

（）最早认识到光是横波的形式存在的。

A、牛顿

B、伽利略

C、托马斯·杨

D、毕达哥拉斯

凭证作废后，凭证产生断号，能否取消断号？