下列物质中,属于纯净物的是( ) A.氧气 B.雪碧饮料 C.河水 D.生理盐水

题型:选择题

问题:

下列物质中,属于纯净物的是(  )

A.氧气

B.雪碧饮料

C.河水

D.生理盐水

考点:纯净物和混合物
题型:选择题

阅读理解。

     Many people like to travel during their vacations. Some people  travel in tour groups because they

think it is safe and cheap. A tour guide takes care of the group and makes sure the group can see a lot

of interesting and beautiful sights. Other   people   like traveling  alone  or  with friends. If you travel by

yourself, you are free to see what you want to see.

     People travel for many reasons. Some people travel  to  learn  more  about  other countries' people,

culture, food and languages. Some people travel for adventure(冒 险). They want to do some different

things, such as skiing, bungee jumping(蹦极跳) and mountain climbing. Other people like to shop when

they travel. They look for new things or cheap ones.

     There are different ways to travel. Some people take trains,  boats or buses, some fly, and others

drive cars. Some people like to travel slowly and spend a long time in each place, while others like to

take quick tours and visit more places in a short time.

1.What does "sights" mean in Chinese in the first paragraph?

A.  视力  

B. 看见    

C. 风景    

D. 情景

2.Why do some people like traveling alone?

A.  Because they want to see interesting sights.

B.  Because they have different ways to travel.

C.  Because they are free to see what they want to see.

D.  Because they want to learn more about people from other countries.

3. According to the passage, people travel for_______.

A. adventure     

B. learning more about another country

C. shopping      

D. all of the above

4. Some people take quick tours because_______.

A. they travel by car.    

B. they like to visit many places in a short time

C. they have much time for traveling  

D. they want to spend a long time in each place.

5. If a person travels for adventure ,he may choose ______ to get a different experience.

A. eating      

B. shopping   

C. bungee jumping    

D. sleeping

题型:选择题

下列强调道德是在社会系统内对社会秩序和整合起作用的主要因素的理论是()

A、戴维斯和摩尔的功能分层理论

B、涂尔干的功能理论

C、帕森斯的社会分层系统功能论

D、以上理论都不是

题型:选择题

患者女,35岁,因“下腹部坠痛1个月,右膝关节肿痛1周”来诊。查体:下腹部轻压痛,无反跳痛。右膝关节红肿、压痛,浮髌试验阳性。

目前诊断需考虑的疾病有()

A.系统性红斑狼疮

B.强直性脊柱炎

C.反应性关节炎

D.炎症肠病性关节炎

E.痛风

F.结核过敏性关节炎

G.细菌性关节炎

题型:选择题

人们总是采取一些行为反应来减轻或消除心理应激的影响,这些行为反应可以分为两类:一类是针对()的行为反应,一类是针对()的行为反应。

题型:选择题

如图所示,用两根轻质细绝缘线把两个带电小球悬挂起来,a球带电+q,b球带电-q,且两球间的库仑力小于b球的重力,即两根线都处于竖直绷紧状态,现突然加一水平向左的匀强电场,待平衡时,表示平衡状态的是如图所示的哪一个

[ ]

A.

B.

C.

D.

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