问题 选择题

下列不是细菌特征的是(  )

A.个体微小,细胞内没有成形的细胞核

B.细胞内没有叶绿体,靠现成的有机物生活

C.能产生孢子,孢子能够发育成新个体

D.通过分裂的方式繁殖后代

答案

细菌没有成形的细胞核,没有叶绿体;

A、细菌是单细胞的,细菌的基本结构有细胞壁、细胞膜、细胞质和DNA集中的区域,故该选项不符合题意;

B、细菌没有叶绿体,都不能进行光合作用,营养方式是异养,故该选项不符合题意;

C、细菌是分裂生殖,真菌进行孢子生殖.故该选项符合题意;

D、细菌通过分裂的方式繁殖后代,故该选项不符合题意.

故选:C.

阅读理解

阅读理解。

     Once a group of 17-year-old schoolboys decided to break the world basketball marathon record (马拉

松记录). They wanted to play for ninety hours and that is to add six hours to the record. Each team has

nine players, with five at a time. The boys decided each person would play 21.5 hours and then rest for 2

hours. Then they started at 6 o'clock in the evening.

    The first night was very hard for the players. When it was their turn to rest, they were too excited to fall

asleep at once. After sleeping for a short time, they had to play again. On the second night, they fell asleep

as soon as they stopped. Some of them had trouble with their feet and hands, but the only serious problem

was a psychological (心理上的) one. Each boy was thinking: Why am I doing this? How can I play any longer?

    After the third night, The players knew they could finish the ninety hours. The basketball on the fourth

night was very slow. But in the final hours, the players got better. For the last few minutes, the players looked

as fresh as when they started. How happy everyone was!

1. In the story, there were ______ schoolboys playing basketball marathon.

A. 9

B. 14

C. 17

D. 18

2. Before this basketball marathon, the world record was ______.

A. 84 hours

B. 86 hours

C. 90 hours

D. 96 hours

3. The first night was hard for the players to fall asleep because ______.

A. they were too excited

B. they only slept for a short time

C. no one watched them play

D. it was very long

4. The word "fresh" in the sentence"…the players looked as fresh as when they started" means ______.

A. 新鲜的

B. 兴奋不已的

C. 精神饱满的

D. 伤痕累累的

5. Which of the following sentences is wrong?

A. Some of the boys were hurt when they played.

B. It was hard for the players to fall asleep at night.

C. The boys started playing at 6 o'clock in the evening.

D. In the end, the boys felt happy.

单项选择题