由形态结构相似、功能相同的细胞聚集起来所形成的细胞群叫做() A.组织 B.器官

题型:选择题

问题:

由形态结构相似、功能相同的细胞聚集起来所形成的细胞群叫做( )

A.组织

B.器官

C.系统

D.细胞

考点:动物体的结构层次关系
题型:选择题
已知函数f(x)=
x2-3tx+18,x<3
(t-4)
x-3
,x≥3
在R递减,则实数t的取值范围是______.
题型:选择题

为了安全与方便,我们应铭记以下的电压值:一节干电池电压______V,我国大陆家庭电路电压是______V,对人体安全的电压是______V.

题型:选择题

某玻璃中含Na2O、CaO、SiO2的质量比约为10∶9∶58,则此玻璃的组成为( )

A.Na2O·CaO·6H2SiO3

B.Na2O·CaO·6SiO2

C.2Na2O·2CaO·9SiO2

D.6Na2O·6CaO·SiO2

题型:选择题

第二部分:阅读理解(共20小题;每小题2分,满分40分)阅读下列短文,从每题所给的四个选项中,选出最佳答案。

Son’s Help

Mr. Lang worked in a factory. As a driver, he was busy but he was paid much. His wife was an able woman and did all the housework. When he came back, she took good care of him and he never did anything at home. So he had enough time when he had a holiday. A few friends of his liked gambling(赌博) and he learned it soon. So he was interested in it and hardly forgot anything except gambling. He lost all his money and later he began to sell the television, watches and so on. His wife told him not to do it but he didn’t listen to her. She had to tell the police. He and his friends were punished for it. And he was hardly sent away. After he came out of lockup(拘留所), he hated her very much and the woman had to leave him.

It was New Year’s Day. Mr. Lang didn’t go to work. He felt lonely and wanted to gamble again. He called his friends and they came soon. But they were afraid the police would come. He told his five-year-old son to go to find out if there were the policemen outside. They waited for a long time and didn’t think the police would come and began to gamble. Suddenly opened the door and in came a few policemen.

“I saw there weren’t any policemen outside, daddy,” said the boy, “so I went to the crossing and asked some to come.”

1.Mr. Lang was paid much because _______.

A. he was a driver            B. he worked in a factory

C. he had a lot of work to do D. he had worked there for a long time

2.Mrs. Lang did all housework because _______.

A. she couldn’t find any work     

B. she thought her husband was tired

C. her husband spent all time in gambling

D. she wouldn’t stop her husband gambling

3._______, so he was put into lockup.

A. Mr. Lang often gambled   B. Mr. Lang was late for work

C. Mr. Lang didn’t help his wife at home     D. Mr. Lang wasn’t polite to the police

4.The woman had to leave Mr. Lang because _______.

A. he didn’t love her any longer   B. he wouldn’t stop gambling

C. he had been put into lockup      D. he was hardly sent away by the factory

5.Which of the following is right?

A. The boy expected his father to be put into lockup again.

B. The boy thought his father needed some policemen.

C. The boy expected his father to stop gambling soon.

D. The boy expected his mother to come back.

题型:选择题

闪络性故障大部分发生于电缆线路运行前的电气试验中,且大都出现于电缆内部。

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