问题 选择题

下列食物链中正确的是(  )

A.蝉→螳螂→黄雀→细菌

B.蝉→螳螂→黄雀

C.树木→蝉→螳螂→黄雀

D.树木→蝉→螳螂→黄雀→细菌

答案

由食物链的定义可以知道:食物链的起点是生产者,终点是消费者,中间用箭头来表示,箭头指向吃的一方,而且它们之间存在吃与被吃的逻辑关系,可以判断:

A、食物链的起点是蝉,属于消费者,不是生产者,终点是细菌为分解者,所以为错误项.

B、缺少起点生产者,为错误项.

C、符合食物链的定义,起点是树,为生产者,终点是黄雀为消费者,所以为正确项.

D、终点是细菌为分解者,所以为错误项.

故选:C

名词解释
单项选择题

Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened between. As was discussed before, it was not until the 19th century that the newspaper became the dominant pre- electronic (61) , following in the wake of the pamphlet and the book and in the (62) of the periodical. It was during the same time that the communications revolution (63) UP, beginning with transport, the railway, and leading on through the telegraph, the telephone, radio, and motion pictures into the 20th-century world of the motor car and the air plane. Not everyone sees that process in (64) . It is important to do so.

It is generally recognized, (65) , that the introduction of the computer in the early 20th century, (66) by the invention of the integrated circuit during the 1960s, radically changed the process, although its impact on the media was not immediately (67) . As time went by, computers became smaller and more powerful, and they became "personal" too, as well as (68) , with display becoming sharper and storage (69) increasing. They were thought of, like people, (70) generations, with the distance between generations much (71) .

It was within the computer age that the term "information society" began to be widely used to describe the (72) within which we now live. The communications revolution has (73) both work and leisure and how we think and feel both about place and time, but there have been (74) view about its economic, political, social and cultural implications. "Benefits" have been weighed (75) "harmful" outcomes. And generalizations have proved difficult.

(69)是()

A.ability

B.capability

C.capacity

D.faculty