问题 探究题

为了研究生命你能够否自然发生的 问题,19世纪60年代,法国学者巴斯德进行了 著名的 鹅颈烧瓶试验 :

⑴ 鹅颈烧瓶放入培养液后要进行灭菌的是_______________________________。

⑵ 第一步实验的说明了:_______________________________________    。

⑶第二步的实验说明了:___________________________。

(4)实验的变量是(   )

A、瓶的大小B、细菌的有C、无肉汤的多少

(5)巴斯德的鹅颈烧瓶试验是否经过重复多次才能得出结论?( )

A、是 B、不是

(6)巴斯德提出了保存酒和牛奶的方法( )

A、巴氏消毒法B 、腌制法 C、脱水法

答案

(1)、使瓶内没有生命存在。

(2)、非生命的物质绝对不能随时自发地产生新生命。

(3)、生物只能来源于生物,非生命的物质绝对不能随时自发地产生新生命。

(4)、B

(5)、A

(6)、A

该题考查的是巴斯德的鹅颈瓶的实验,鹅颈烧瓶放入培养液后要进行灭菌是为了让瓶内没有微生物的存在,鹅颈瓶内放置一段时间,仍然没有微生物,说明微生物不是肉汤自己产生的,打断鹅颈,肉汤内有大量的微生物,说明微生物是由空气进入的,该实验的变量是细菌的有无,保存食品的方法是巴氏消毒法,即低温消毒法,低温杀死细菌。

阅读理解

When I was a child, my parents always told me that I should never talk to strangers. This was part of a whole list of things I should never do: Never accept food or candy from strangers, never get in a car with strangers, and so on.

But if we didn’t start a conversation with strangers, we’d never make new friends. We’d never get a job. We may miss the joy that comes from talking with strangers. And the more people you know, you more chances you can get.

The following passage offers you some advice on how to break the ice.

Don’t just stare at your shoes. Go and say “Hi” to that new guy. It will be easier to break the ice if you know more about different cultures.

British: Beautiful day, isn’t it?

The weather in Britain is changeable. So, it is one of the topics the British care most about. And there’s a simple rule: Say “Yes” whether you agree with the person’s idea on the weather or not. That’s because the British start a conversation using the weather so that they can continue their talk.

French: Where did you go on holiday?

To talk with a French person, the safest way is to ask his or her last holiday. French students enjoy a 10-to-15-day holiday every two months. French employees get more than six weeks of holidays per year.

American: So, where are you from?

The US is so big and people move so often that location is always a source(来源) of talk. You can try to find a connection with the place they’re from. For example, if someone’s from Los Angeles, you could say:“Oh, I have a friend who studied there”

小题1:Why did the writer’s parents tell him not to talk to strangers?

A.It was dangerous.

B.Is wasted time.

C.It was part of the life.

D.Their son didn’t like to talk to strangers.小题2:The best thing to talk with British is          .

A.the fog

B.the rain

C.the weather

D.the wind小题3:To talk with a French person, the safest way is           .

A.his or her family

B.his or her parents

C.his or her friends

D.his or her last holiday小题4:The location is always a source of talk in America because         .

A.They are energetic

B.They love their home

C.Los Angeles is their location

D.The US is so big and people move so often小题5:According to the passage, the writer thinks               .

A.his parents were right

B.he can talk with strangers freely

C.It is necessary to talk with strangers

D.he can find jobs easily

单项选择题