问题 选择题

在一块农田中,田鼠吃农作物,蛇吃田鼠,鹰吃蛇,这些生物共同构成了(  )

A.食物网

B.生产者

C.食物链

D.生态系统

答案

解;食物链反映的是生产者与消费者之间吃与被吃这种关系的,所以食物链中不应该出现分解者.食物链的正确写法是:生产者→初级消费者→次级消费者…注意起始点是生产者.不能有分解者和非生物部分.田鼠吃农作物,蛇吃田鼠,鹰吃蛇,体现了生产者与消费者之间吃与被吃这种关系,因此这些生物共同构成了食物链:农作物→田鼠→蛇→鹰.食物网有多条食物链交织而成;农作物是生产者,田鼠、蛇、鹰是消费者;生态系统的组成包括生产者、消费者、分解者和非生物部分.因此,在一块农田中,田鼠吃农作物,蛇吃田鼠,鹰吃蛇,这些生物共同构成了食物链.

故选C.

阅读理解

Mrs. Baker’s sister was ill. She had someone to look after her from Monday to Friday, but not at the weekend, so every Friday evening Mrs. Baker used to go off to spend the weekend with her at her home in a neighbouring town. But as Mr. Baker could not cook, she had arranged (安排) for his sister to come over and spend the weekend looking after him at their home. This meant that Mr. Baker had busy time when he came home from work on Friday evenings. First he had to drive home from the railway station. Then he had to drive his wife to the station to catch her train. And then he had to wait until his sister’s train arrived, so as to take her to his house.

Of course, on Sunday evening he had to drive his sister to the station to catch her train back home, and then wait for his wife’s train, so as to bring her home.

One Sunday evening, he had seen his sister off on her train and was waiting for his wife’s arrival when a porter ( 搬运工 ), who had often seen him at the station, came over and spoke to him, “You are having a lot of fun,” he said, “ But one day one of those women is going to catch you with the other, and then you will be in real trouble!”

小题1: Who was ill?  ___________

A.Mr. Baker

B.Mrs. Baker

C.Mr. Baker’s sister

D.Mrs. Baker’s sister小题2: Who looked after the sick person on weekdays?

A.Mr. Baker’s sister

B.Mrs. Baker’s sister

C.Mrs. Baker

D.Someone acting as a nurse小题3: Why did Mr. Baker go to the railway station on Friday and Sunday evening? __________

A.Because he had to see his wife and sister off and brought them home.

B.To take his sister to his own home.

C.To bring his wife back home.

D.To look after his sister.小题4: Where did Mr. Baker spend the weekend?  ___________

A.At home

B.In his office

C.In his sister’s home

D.In a neighbouring town小题5: Why did the porter say Mr. Baker would be in trouble?   Because __________.

A.Mr. Baker was making fun of the two ladies

B.Mrs. Baker would laugh at her husband

C.He thought the two women are Mr. Baker’s girl friends

D.The two ladies were playing games with Mr. Baker

简答题