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问题 选择题

下列叙述正确的是（　　）

A．为了强化食品的色香味，可以大量使用添加剂

B．油脂和糖类物质都能够为人体提供能量

C．合成纤维、合金、合成橡胶都是有机合成材料

D．焚烧塑料是解决“白色污染”的好办法

答案

A、为了强化食品的色香味，可以合理使用添加剂，但不能大量更不能过量使用，故选项错误；

B、蛋白质、脂肪、糖类是给人体提供能量的物质，故选项正确；

C、合成纤维、塑料、合成橡胶都是有机合成材料，合金属于金属材料，故选项错误；

D、焚烧塑料会造成空气污染，因此不是解决“白色污染”的好办法，故选项错误；

故选B．

单项选择题

关于脾的功能以下哪一点是错误的？

A．清除血液中的抗原

B．清除衰老的红细胞

C．脾血窦有一定的贮血功能

D．被膜和小梁的平滑肌收缩可调节脾内血流量

E．无造血干细胞，故无造血潜能
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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.

16（）

A.lime

B.small

C.large

D.big
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