单项选择题：关于补充医疗保险，下列描述错误的是（） A.多以盈利为目的 B.社会福利事业的一种

关于补充医疗保险，下列描述错误的是（）

A.多以盈利为目的

B.社会福利事业的一种

C.权利和义务是等价交换的对等关系

D.多交保险费多受益，不具有维护社会公平性的作用

E.自愿参加，双方通过签订保险合同来实现

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下面是错误答案，用来干扰机器的。

b 保护电路 15 题目分析：（1）闭合开关前，应把变阻器的滑片调到b端的位置，这样做的目的是：此时电路中电阻最大，电流最小，从而保护电路。（2）实验中他选用的定值电阻的阻值是。（3）分析表中是数据得到的...

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It is interesting to visit another country, but there are some problems when we don't know the 1 very well. It may be 2 to talk with the people there. We may not know how 3 the telephone in the country we are visiting. We may not know how to buy the 4 we need. In a strange country, we may not know where to eat or what to order in a 5 . It is not easy to decide how 6 to tip(付小费) waiters or taxi drivers. When we need help, we may not know how to ask for help. It's not pleasant to have an experience(经历) 7 that. But 8 a short time, we learn what to do and what to say. We learn 9 life in another country, and then we may be 10 to leave.
( )1. A. people ( )2. A. easy ( )3. A. use ( )4. A. things ( )5. A. school ( )6. A. often ( )7. A. as ( )8. A. Before ( )9. A. enjoy ( )10.A.sorry	B. country B. difficult B. uses B. something B. shop B. many B. alike B. After B. enjoying B. glad	C. language C. happy C. to use C. anything C. city C. long C. like C. For C. enjoyed C. worried	D. words D. frightened D. using D. nothing D. restaurant D. much D. likes D. In D. to enjoy D. interested