问题 选择题

岳麓山上所有的生物与它的生活环境一起构成了(  )

A.食物网

B.生态系统

C.生产者

D.食物链

答案

在自然界,任何生物群落都不是孤立存在的,它们总是通过能量和物质的交换与其生存的环境不可分割的相互联系相互作用着,共同形成一种统一的整体,这样的整体就是生态系统.换句话说,生态系统就是在一定的地域内,生物与环境构成的统一的整体.其中环境就是生物生存的非生物条件,生物包括植物、动物、细菌真菌等,植物是生产者,能进行光合作用制造有机物.动物是消费者,不能进行光合作用自己制造有机物,它们直接或间接以植物为食.动物植物死后的遗体遗物被细菌、真菌分解成二氧化碳和水、无机盐等,二氧化碳、水、无机盐又被植物体利用.它们是生态系统的生物部分.食物链表示生产者与消费者之间吃与被吃的关系,多条食物链交织在一起就构成食物网.

故选B

单项选择题
阅读理解

阅读理解。

     Many people say that the United States is a paradise for the children, a struggling field for the youth and a

tomb for the aged. However, the situation is quite different in Australia. Different people have their own ways

for enjoyment and their own worlds of pastime.

     Most children often work hard in school since they have to face various exams. After school they do not

want to confine themselves to books any more. Instead, they put aside their schoolbags at home and sneak

quickly to some quiet street corners for their games. Bigger children like to shoulder their large kites to some

steep cliffs, and jump to fly in the sky with their kites.

     Some old people often get up early in the morning and go to parks to do newspaper reading. After breakfast,

they come to horse races, dog races and sometimes car races for betting. If he wins, he will feed himself a

good dinner. In the evening, they stay at home, watching TV sometimes with grandchildren. Some of the aged

also enjoy fishing and gardening.

     Young people prefer to go outing for holidays. At the weekends, they go to the seashore for swimming or

to the forest for hunting and camping, or mountainous areas for picnicking. Then in the evenings on Sundays,

they start their long bumper-to-bumper drive back on the highways. Nobody seems in a hurry.

     The Australian government also encourages its people to have more relaxation after work. Sometimes,

certain kind of financial help is distributed to people going on holidays and public holidays are purposely set on

Monday or Friday so that Australians may have a longer weekend for enjoyment. They think people can work

better only after they get a full relaxation. And it grows out of this idea that relaxation comes the top priority

(优先权) for enjoyment in Australia.

1. According to many people's opinion, which of the following is NOT true? [ ]

A. All people in the US live a desirable life.

B. The competition among American young people is fierce.

C. The life of the American old people is very terrible.

D. Children in America are extremely happy.

2. Australia is different from America because Australia _____. [ ]

A. is not a paradise for children

B. is not a struggling field for the youth

C. is not a tomb for the aged

D. has different worlds for different people

3. There is an idea of enjoyment priority in Australia because _____. [ ]

A. enjoyment is more important than other aspects of life

B. a full relaxation will make people work better

C. enjoyment can make people happy

D. Australian people are lazy

4. The underlined part can be replaced by "_____". [ ]

A. adjust themselves to

B. prevent themselves from

C. limit themselves to

D. satisfy themselves with