问题 填空题

中国饮料市场已成为中国食品行业中发展最快的市场之一,饮料一般可分为含酒精饮料和无酒精饮料。

(1)白酒属于含酒精饮料,白酒中的溶剂是水,主要溶质是                

(2)运动以后除了补充水外,还需要补充一些电解质,某种电解质饮料中含有氯化钠、氯化钾、硫酸镁等,其中的硫酸镁属于                  。 A.金属单质 B.酸 C.碱 D.盐

(3)李江同学取少盘该饮料装入试管。加入过量BaCl2溶液后产生白色沉淀,其化学反应方程式为                           。 李江将试管中的混合物过滤,在滤液中加入AgNO3溶液后也产生白色沉淀,该白色沉淀的化学式是              

答案

(1)酒精(或乙醇、C2H5OH)

(2) D

(3) MgSO4+BaCl2====BaSO4↓+MgCl2;AgCl

单项选择题
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.

6()

A.which

B.where

C.as

D.that