问题 选择题

下列变化中,属于物理变化的是

A.酒精燃烧

B.矿石粉碎

C.菜刀生锈

D.葡萄酿酒

答案

答案:B

分析:化学变化是指有新物质生成的变化.物理变化是指没有新物质生成的变化.化学变化和物理变化的本质区别是否有新物质生成.

解:A、酒精燃烧的过程中有新物质生成,属于化学变化.故A不正确;

B、矿石粉碎的过程中没有新物质生成,属于物理变化.故B正确;

C、菜刀生锈的过程中生成了新物质铁锈,属于化学变化.故C不正确;

D、葡萄酿酒的过程中有新物种生成,属于化学变化.故D不正确.

故选B.

阅读理解

阅读理解。

     In Japan, you say "itadakimasu"("I am going to start")before eating, and "gochisosam(deshita)"

("Thank you for the meal")after finishing the meal.

◆Eating rules

     Blowing your nose in public, and especially at the table, is considered bad manners.It is considered

good manners to eat up all the things in your plate.Unlike in some other parts of East Asia, it is

considered bad manner to burp(打嗝).After eating, try to move all your dishes back to the same

position they were at the start of the meal.

◆Drinking rules

     When drinking alcohol(酒), it is a good manner to serve each other, instead of serving yourself.

Check your friends' cups from time to time and refill(重新注满)their drinks if their cups are getting

empty.If someone wants to serve you more alcohol, you should quickly empty your glass and hold

it towards that person.

     While it is considered bad manners to become drunk in some formal restaurants, the same is not

true for other small restaurants, as long as you do not trouble other guests.

     Do not start drinking until everybody at the table is served and the glasses are raised for a drinking

salute(口号), which usually is "kampai".

1.In Japan, you say "itadakimasu" ______.  

A.before eating

B.while eating

C.after eating

D.before drinking

2.All these are good manners in Japan except ______.

A.eat up all the things in your plate

B.after eating, move all your dishes back

C.serve alcohol to each other

D.blow your nose in public

3.From the second paragraph we may know that ______.  

A.in Japan you may burp after eating 

B.in some East Asian countries you may burp after eating

C.in some West Asian countries you may burp after eating

D.in the western countries you may burp after eating

4.If someone wants to serve you more alcohol in Japan, you should______.    

A.serve them quickly

B.refuse it politely

C.say "That's enough"

D.empty your glass and hold it

5.Which of the following is the right drinking rule?  

A.When drinking alcohol, it is a good manner to serve yourself.

B.Check your friends' cups from time to time and refill them if they are empty.

C.It is considered bad manners to become drunk in all the restaurants.

D.Start drinking if only one person is not served.

解答题