保护环境，就是保护我们人类共有的家园．目前我国城市环境中主要的大气污染物不包括（

Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which he may count towards a degree. In many American universities the total work for a degree consists of thirty-six courses each lasting for one semester. A typical course consists of three classes per week for fifteen weeks; while attending a university a student will probably attend four or five courses during each semester. Normally a student would expect to take four years attending two semesters each year. It is possible to spread the period of work for the degree over a longer period. It is also possible for a student to move between one university and another during his degree course, though this is not in fact done as a regular practice.

For every course that he follows a student is given a grade, which is recorded. and the record is available for the student to show to potential employers.  All this imposes(增加)  a constant pressure and stress of work, but in spite of this some students still find time for great activity in student affairs. Elections to positions in student organizations arouse much enthusiasm. The effective work of maintaining discipline is usually performed by students who advise the academic authorities. Any student who is thought to have broken the rules, for example, by cheating has to appear before a student court. With the enormous numbers of students. the operation of the system does involve a certain amount of activity. A student who has held one of these positions of authority is much respected and it will be of benefit to him later in his career.

小题1:Normally a student would at least attend __________classes each week.

A．36

B．12

C．20

D．15小题2:According to the first paragraph an American student is allowed

A．to live in a different university

B．to change permanently his or her university

C．to live at home and drive to classes

D．to get two degrees from two different universities小题3:American university students are usually under pressure of work because__________. 

A．their academic performance will affect their future careers

B．they are heavily involved in student affairs

C．they have to obey university rules

D．they want to run for positions of authority小题4:Some students are enthusiastic for positions in student organizations probably because_________.

A．they hate the constant pressure and stress of their study

B．they will then be able to stay longer in the university

C．such positions help them get better jobs

D．such positions are usually well paid小题5:The student organizations seem to be effective in__________.

A．dealing with the academic affairs of the university

B．ensuring that the students observe university regulations

C．evaluating students' performance by bringing them before a court

D．keeping up the students' enthusiasm for social activities

热电阻元件有几种校验方法？

患者，男，55岁。昨天中午参加婚宴后下午开始腹痛，为持续性胀痛，牵涉到后背，伴恶心、呕吐。有胆囊结石病10年。查体；体温37.2℃，血压110/82mmHg，脉率108次/分，呼吸24次/分，巩膜可疑黄染，上腹膨隆，全腹压痛，以左上腹为重，轻度肌紧张，肠鸣音1～2次/分。WBC11×10⁹/L，N80%，血淀粉酶1500U/L，尿淀粉酶2200U/L，B超显示胆囊多发结石，胆总管宽0.8cm，胰腺增大，边界不清，胰周有积液。

对该患者的可能诊断是（）

A.上消化道穿孔

B.急性胆囊炎

C.急性胰腺炎

D.急性胆管炎

E.胰腺癌

根据军队建设的需要，军队院校可以从青年学生中招收（）。

A、士官

B、士兵

C、学员

D、军官