各学校加强食品卫生管理、保护水源、消毒餐具等有利于预防（） A．消化道传染病 B

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     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 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. The word "sights" in the first paragraph means "_____" in Chinese.

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

在除法算式里，余数是4，除数可以是[ ]

A．3    

B．4    

C．2    

D．比4大的数

据《人民日报》报道，为进一步推进西部大开发，在继续搞好已开工的10大建设项目的同时，国家计划再开工12个重点工程项目，总投资约3000亿元。国家对西部地区的投资

A．属于社会保障支出

B．是国家用于行政管理和国防方面的支出

C．是经济结构调整的动力和源泉

D．体现着政府的政策和活动方向

X、Y、Z三种固体（均不含结晶水）物质的溶解度曲线如右图所示。回答下列问题：

①在  （ 11）   ℃时X、Y两种物质的溶解度相等。

②20℃时，若将Z的饱和溶液加热，则Z的溶液质量分数将

   （12）（填写“增大”“减小”“不变”）。

③60℃时，X的饱和溶液的质量分数为 （13） （用小数 表示并精确到0.01）。

④40℃时，把20g 固体X溶解到（14）g水中，可以得到饱   Z

和溶液，若要配制该饱和溶液，进行实验时，下列还必须用到 的仪器有（15） （选填编号）。

A．漏斗

B．玻璃棒

C．胶头滴管

D．试管

产品或部件表面上的整体平整程度称为（）。

A、翘曲度

B、平整度

C、位差度

D、光滑度