农药的发展趋势是选用（），走仿生化的道路。A.高效 B.低毒 C.无污染 D.低残毒

以下提供若干组考题，每组考题共同使用在考题前列出的A、B、C、D、E五个备选答案。请从中选择一个与问题关系密切的答案。每个备选答案可能被选择一次、多次或不被选择。

破伤风抗毒素皮试液的浓度是( )

A．0.75mg/ml
B．200～500U/ml
C．1500U/ml
D．100U/ml～500U/ml
E．2500U/ml

有关胆管梗阻CT检查的说法，哪项错误()

A．正常肝内胆管在CT上不能显示，若显示则为异常

B．肝内胆管直径达5mm，则认为胆管轻度扩张

C．肝内胆管直径达9mm以上为重度扩张

D．肝总管和胆总管扩张(直径>1cm)，可见自上而下连续不断的环影

E．环影消失的层面为扩张的胆管末环，提示胆道梗阻的部位

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 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 a lecture is often different from the

information in your textbooks. 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 another 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. We can learn from the passage that university professors _____.

A. spend about 5 hours on lectures each week

B. must join the students in the discussion sections

C. prefer to use textbooks in their lectures

D. require the students to read beyond the textbooks

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

简述解除卤虫卵滞育的方法。

南非前总统曼德拉说过：“当我走出囚室迈向通往自由的监狱大门时，我已清楚，自己若不能把痛苦与怨恨留在身后，那么其实我仍在狱中。”这一名言蕴含的哲理是（）

①主次矛盾在一定条件下相互转化

②矛盾双方在一定条件下相互转化

③运动和静止是对立统一的

④意识具有能动作用

A.①②

B.②③

C.③④

D.②④