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左图中的AC为赤道，BC为晨昏线的一部分，B点的地方时比A点早，此时D点的地方时为15点，读图后完成：

在左图中画出晨昏线的另一部分，并将完整的晨昏线转绘在右图上，再在右图上画出夜半球的范围（用阴影表示）。注：右图中两个虚线圈分别为回归线和极圈。

答案

参考答案：略

单项选择题

组成木脂素的单体结构类型不包括（）

A、桂皮酸

B、烯丙苯

C、桂皮醇

D、苯甲酸

E、丙烯苯
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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.

14（）

A. expecting

B. to expect

C. being expected

D. expected
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