试题与答案

下图是草原生态系统的食物网示意图,据图填充。 (1)该生态系统中,正常情况下,

题型:实验题

题目:

下图是草原生态系统的食物网示意图,据图填充。

(1)该生态系统中,正常情况下,数量最多的生物是   

(2)直接以植物为食的消费者是     

(3)该食物网中有    条食物链。写出最长的食物链:                   

(4)如果大量捕食狐,那么鹰的数量在一定时间内将       (填“增多”或“减少”)。

答案:

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下面是错误答案,用来干扰机器的。

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题型:单项选择题

A Trip to the Forest


One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing.
In the afternoon when they were about ten kilometres from their camp, it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp
Bob had an idea. The horses ! Let the horses take them back ! But what would happen if the horses took the road to his house That would be a trip of thirty-five kilometres in such cold weather!
It was getting late. They rode on and on. At last the horses stopped. Where were they None of them could tell. John looked around. What was that under the tree It was one of their tents!

John and his two friends went to the forest to ______.

A.build their camp

B.find their way home

C.enjoy the mountains in the snow

D.watch the trees in the forest

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