问题 选择题

某学习合作小组在讨论生物的基本特征时,出现以下四种说法,其中正确的是(  )

A.生物都需要从外界获取食物

B.生物都需要吸入氧气,呼出二氧化碳

C.同种的生物都是完全一样的

D.生物对外界刺激能作出一定的反应

答案

A、植物通过光合作用制造出自身所需要的淀粉等营养物质,并不需要从外界获取食物.故选项A错误;

B、绝大多数生物需要吸入氧气,呼出二氧化碳.如无氧呼吸的生物并不需要吸入氧气,故选项B错误;

C、生物性状的变异是普遍存在的.可以说完全一样的生物并不存在,故选项C错误;

D、生物能对外界刺激作出反应,属于生物的特征.

故选D

单项选择题 A型题
阅读理解

阅读理解。

     Two friends were waiting at the bus-stop for the last bus but they were afraid that they had missed it.

There were no cars passing by and not a single public telephone nearby to call for a taxi. They began to

feel nervous. It was already late. What could they do to get home?

     Then, as they looked up, they saw a bus approaching them slowly. The last bus! They had not missed

it after all.

     When the bus stopped at the bus-stop, the two young boys rushed up the bus in relief. Then, the bus

started moving. Only after a few minutes did the boys realize that something was seriously wrong.

     Firstly, the bus was moving far too slowly. Secondly, there was no conductor to collect their fare.

Thirdly, when they went to the front of the bus to check, there was no driver!

     With their hair standing on ends, they looked at each other with eyes wide open and started to scream.

     Then the bus stopped! The driver and the conductor appeared from behind the bus. They had been

pushing it!

1. Why did the two friends feel nervous?

A. It was very late at night.

B. They had missed the last bus.

C. They knew the last bus could not come.

D. There seemed to be no way for them to get home.

2. What can we learn from the underlined part in the 5th paragraph?

A. The boys were very frightened.

B. The boys' hair was falling down.

C. The boys felt extremely excited.

D. The boys were wearing strange hair styles.

3. The bus was moving very slowly because _____.

A. the driver was absent

B. it was running out of petrol

C. it was being pushed along by two people

D. the two boys had not paid for their tickets