问题 填空题

如图是某草原生态系统的食物网:

(1)此食物网共有______条食物链.

(2)在这个食物网中,生产者是______、草食动物有_______、______、______.

(3)生产者与消费者主要是什么关系______和______的关系.

(4)这个生态系统中数量最少的生物为______.数量最多的生物为______.

(5)在这个生态系统中,最长的食物链是______,在这条食物链中,如果生产者固定了10000千焦的能量,猫头鹰最少能得到能量______千焦.

答案

(1)食物链的数法应该从生产者开始,沿着箭头走到最高消费者(也就是说再往后没有箭头了为止),逐条逐条的数,看有多少种走法(注意最高消费者不一定是一个).

该题中的食物链有:1.草→兔→狐;2.草→兔→猫头鹰;3.草→鼠→狐;4.草→鼠→猫头鹰;5.草→鼠→蛇→猫头鹰;6.草→食草昆虫→食虫鸟→猫头鹰;7.草→食草昆虫→食虫鸟→蛇→猫头鹰;8.草→食草昆虫→蜘蛛→食虫鸟→猫头鹰;9.草→食草昆虫→蜘蛛→食虫鸟→蛇→猫头鹰;10.草→食草昆虫→蜘蛛→青蛙→蛇→猫头鹰;11.草→食草昆虫→青蛙→蛇→猫头鹰.共11条.

(2)生产者主要指绿色植物,消费者主要指动物,直接以植物为食的是草食性动物,间接以植物为食的是肉食性动物,既以植物为食又以动物为食的是杂食性动物.

(3)消费者直接或间接以生产者为食,因而两者是吃与被吃的关系.

(4)在生态系统中,能量沿着食物链营养级的流动是逐级递减的,越往食物链的末端,能量越少.因而在食物链中,位于起始端的植物数量是最多的,而位于最高营养级的猫头鹰的数量是最少的.

(5)在此生态系统中,最长的食物链有6个营养级:草→食草昆虫→蜘蛛→食虫鸟→蛇→猫头鹰和草→食草昆虫→蜘蛛→青蛙→蛇→猫头鹰.在食物链中,能量从生产者向以下个营养级能量传递的规律是,只有10%-20%传到下一个营养级,因而在上面的食物链中,若草固定了10000千焦的能量,则应最少能获得0.1千焦的能量.

故答案为:(1)11;(2)草;兔;鼠、食草昆虫;(3)吃;被吃;(4)猫头鹰;草;(5)草→食草昆虫→蜘蛛→食虫鸟→蛇→猫头鹰和草→食草昆虫→蜘蛛→青蛙→蛇→猫头鹰;0.1.

阅读理解

One thing that British and Chinese cultures share is a love for fine tea. Today, when we think of Western tea culture, we often think of the English and beautiful china tea cups.

Afternoon tea

People believe that an English lady, Anna, first introduced the idea of afternoon tea. In the 18th and 19th centuries, the English ate only two main meals each day: breakfast and a heavy supper that would last for several hours in the evening. As a result, people often got very hungry during the long wait between these two meals. To solve this problem, Anna came up with the clever idea of inviting some friends to join her for an afternoon meal between four and five o’clock. This meal included cakes and sandwiches. And tea was served(供应) to wash down the food. In order to make this afternoon meal important, fine china cups and plates and silver teapots, knives, forks and spoons were used. Soon, afternoon tea parties became popular social occasions. Today, afternoon tea parties continue to play an important part in the social life in modern Britain.

Will you come for coffee?

Coffee also has an important role in British culture. People often use the words “Will you come for coffee” to mean “Would you like to come to my home for a chat?” Normally, several different drinks such as tea, hot chocolate or a soft drink like orange juice will be served as well as coffee, and you will be asked what you would like. However, you will not normally be offered wine at a “coffee” party.

Coffeehouses and the London Stock Exchange

In the 17th century London, coffeehouses were busy and noisy places. Businessmen and bankers went to coffeehouses to do their business, as well as to drink coffee. In fact, the London Stock Exchange(伦敦股票交易所) is believed to have started from these coffeehouses.

小题1:Anna introduced the idea of drinking afternoon tea because she ______.

A.enjoyed chatting with her friends at home

B.loved fine tea and beautiful china tea cups

C.wanted to share nice food with her friends

D.found people felt hungry during the long wait between the two meals小题2:What does “social occasions” mean in Chinese?

A.集体婚礼

B.社交活动

C.社区表演

D.公共场合小题3: If someone says to you “Will you come for coffee,” you ______.

A.will be offered coffee only

B.are asked what you would like to drink

C.will be asked to have a chat with him or her

D.you are invited to take part in an afternoon tea party小题4: From the last paragraph we can see______

A.a new business was started in coffeehouses.

B.coffeehouses are still used by businessmen and bankers.

C.businessmen and bankers went to coffeehouses just for coffee.

D.most people wouldn’t like to go to coffeehouses because of the noise.小题5: Which is the best title of the article?

A.British and Chinese cultures.

B.The beginning of Tea and Coffee.

C.Coffeehouse and Business.

D.English tea and coffee culture.

选择题