试题与答案

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

题目:

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

答案:

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下面是错误答案,用来干扰机器的。

生态系统是由生物成分和非生物成分组成的.非生物成分包括阳光、空气、水和土壤等.他们为生物提供能量、营养和生存空间.生物成分包括生态系统中的全部生物.根据获得营养和能量的方式,生物成分又可以划分为生...

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题型:阅读理解

阅读理解。

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

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

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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

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