使用的（），棉纱布头和纸等必须存放在盖严的铁桶内。

亚慢性毒性试验的主要目的是（）。

A.探讨阈剂量及最大无作用剂量

B.观察中毒症状

C.探讨剂量反应关系

D.预测有无潜在性危害

E.以上都是

遥感信息获取的关键是（）。按照天线结构的不同，侧视雷达分为（）和（）。

国务院全体会议由国务院 * * 、副 * * 、各部部长、各委员会主任、审计长、秘书长和 ( )组成。

A．各省省长

B．各省省委书记

C．国务委员

D．中 * * 政治局委员

英国经济学家凯恩斯曾对1550-1650年这一时期有过如下描述：“近代世界编年史上，从未存在过对商人、投机者和暴发户来说如此持久、如此可贵的一个良机。”该“良机”出现主要得益于（）

A.文艺复兴

B.新航路开辟

C.启蒙运动

D.工业革命

There is virtually no limit to how one can serve community interests, from spending a few hours a week with some charitable organization to practically full-time work for a social agency. Just as there are opportunities for voluntary service (1) (VSO) for young people before they take up full-time employment, (2) there are opportunities for overseas service for (3) technicians in developing countries. Some people, (4) those who retire early, (5) their technical and business skills in countries (6) there is a special need.

So in considering voluntary or (7) community service, there are more opportunities than there (8) were when one first began work. Most voluntary organizations have only a small full-time

(9) and depend very much on volunteers and part-timers. This means that working relationships are different from those in commercial organizations, and values may be different. (10) some ways they may seem more casual and less efficient, but one should not (11) them by commercial criteria. The people who work with them do so for different reasons and with different (12) , both personal and (13) . One should not join them (14) to arm them with professional experience; they must be joined with commitment to the (15) , not business efficiency. Because salaries are (16) or non-existent many voluntary bodies offer modest expense. But many retired people take part in community service for (17) , simply because they enjoy the work.

Many community activities possible (18) retirement were also possible during one’s working life but they are to be undertaken (19) seriously for that. Retired people who are just looking for something different or unusual to do should not consider (20) community service.

2（）

A.as

B.so

C.then

D.that