问题 选择题

某校生物兴趣小组的同学,在探究“口腔对淀粉的消化作用”时,进行了以下实验并作了相应的分析,其中正确的是(  )

试管编号1号2号3号
等量馒头碎屑碎屑馒头块
唾液或清水2ml唾液2ml清水2ml唾液
是否搅拌充分搅拌充分搅拌不搅拌
保温37℃水浴保温10分钟
加入碘液2滴

A.滴加碘液后,2号试管内的液体不变蓝

B.此实验设计中有三组对照实验,分别是1号和2号、1号和3号、2号和3号

C.滴加碘液后,1号试管不变蓝的原因是馒头中的淀粉被唾液中的淀粉酶分解

D.通过实验可以证明口腔对淀粉的消化与牙齿的咀嚼和舌的搅拌无关

答案

答案:C

阅读理解

阅读理解。

     Traveling to every part of the world gets easier, but how well do we know and understand each other. Here's a simple test. Imagine you are planning to hold  a  meeting at four  o'clock. What time  should you

expect your foreign business friends to arrive?  If  they  are  Germans,  they'll arrive on time.  If  they  are

Americans, they'll probably be  15  minutes early.  If they are Englishmen, they'll be 15 minutes late,  and

you should allow up to an hour for the Italians.

     The British seemed to think since the English language was widely used  in  the world,  people  would

always understand what they do.  However, they found they were completely wrong.  For example,  the

British are happy to have a business lunch and discuss business matters and have a drink during the meal.

The Japanese prefer not to work while eating.   Lunch is a time for them to relax and get  to  know  each

other and they don't drink at lunchtime. The Germans like to talk business before dinner. The French like

to eat first and talk afterwards. They have to be well fed and watered before they discuss anything.

1. What do the Germans prefer when they go to a meeting?

A. They prefer to be on time.

B. They prefer to arrive very early.

C. They prefer to arrive very late.

D. They prefer to arrive a little late.

2. According to the text, if a group of Englishmen, Americans and Italians hold a meeting, who will be the last to arrive? 

A. The Englishmen.

B. The Americans.

C. The Italians.

D. Both the Englishmen and the Italians.

3. What do the Japanese like to do at lunchtime?  

A. To drink.

B. To get to know each other.  

C. To talk business.

D. To eat only.

4. According to the writer, the British like to ________. 

A. arrive on time and talk business during the meal

B. arrive earliest and hate talking business at a meal

C. arrive 15 minutes late and talk business after the meal

D. arrive a few minutes late and discuss business during the meal

5. By giving us the two examples, the writer means to show us that _______. 

A. different countries have different cultures in different parts of the world

B. the Germans are more serious and have good living habits

C. the Italians are careless people and they are never on time for everything

D. the French people are very lazy. They prefer eating and drinking more

单项选择题