问题 填空题

(6分)请从下列物质中选择适当的物质填空(填序号):

A.干冰

B.盐酸

C.煤

D.石油E.小苏打     F.硝酸钾      G.葡萄糖      H.烧碱

(1)能被人体直接吸收的营养物质是   ;(2)可用于人工降雨的物质是   

(3)常用于铁制品表面除锈的是     ;  (4)被誉为“工业的血液”的是 

(5)农田施用的复合肥是     ;        (6)常用于治疗胃酸过多的是   

答案

(1)G   (2)A    (3)B   (4)D    (5)F     (6)E

(1)葡萄糖能被人体直接吸收,是重要的营养物质,故填 G;

(2)干冰升华能吸收大量的热,可使水蒸气凝结,常用于人工降雨,故填 A;

(3)铁锈的主要成分是氧化铁,氧化铁能溶于稀盐酸,故盐酸可用于铁制品表面除锈,故填 B;  

(4)石油被誉为“工业的血液”,故填 D;

(5)硝酸钾中含有钾和氮两种营养素,属于复合肥,故填 F;        

(6)胃酸的主要成分是盐酸,它能和小苏打反应生成二氧化碳气体,故常用于治疗胃酸过多的是小苏打,故填 E.

问答题 简答题
单项选择题

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.

11()

A.look at

B.comment

C.enjoy

D.judge