古代婚俗中，新郎官“踢轿门”是什么意思？（） A.示意轿夫好好抬轿 B.学胡人婚俗

湿式自动喷水灭火系统每个报警阀组控制的喷头数不应超过（）。

A.250只

B.400只

C.500只

D.800只

保持良好的注意力，是大脑进行感知、记忆、思维等认识 (145) 的基本条件。在我们的学习 (146) 中，注意力是打开我们心灵的门户，而且是唯一的门户。门开得越 (147) ，我们学到的东西就越多。而一旦注意力涣散了或无法 (148) ，心灵的门户就关闭了，一切有用的知识信息都无法进入。 (149) ，良好的注意力会提高我们工作与学习的 (150) 。

A．运动
B．活力
C．生活
D．活动

阅读理解。

     Bill was fourteen years old. He had a part-time job which made him get up at five. He was a newspaper

boy. Though it was hard work, he enjoyed it a lot.

     Each morning, Bill left his house at five fifteen to go to the corner. The newspapers had been sent to the

corner by a truck at midnight. He always rode a bike to carry them.

     In winter it was still dark when he got up, but during the rest of the year it was bright. Bill had to send

the newspapers to the houses of people in all kinds of weather. He tried to put each paper in the box where

it would be kept safe from wind and rain or snow. His customers are in different places. Since many of them

worked during the day, Bill had to get the money at night. Sometimes Bill's customers gave him some more

money for his good work. When Bill was ill, his elder brother had to send the newspapers. Once, Bill's father

had to help him.

     Bill had 70 customers, but he hoped to get more soon. Some day, if he got many more customers, perhaps

Bill could win a prize for being a very good newspaper boy, he would win a visit to Europe, but his wish is that

he could win a new bike.

1. when Bill was ill, his ______ usually helped send the newspapers.

A. younger brother

B. customers

C. father

D. elder brother.

2. Bill's customers gave him some more money for his ______.

A. little work

B. getting up so early every day

C. good service

D. collecting money at night

3. If he worked very well, he might ______.

A. have a chance to visit Europe

B. have more newspapers

C. have chance to visit a few countries

D. have a travel in Europe and a new bike

若（x+a）（x+b）=x²-kx+ab，则k=______．

常用的肌力评定方法有（）

A.MMT

B.拉力器

C.等速肌力测试仪

D.握力计

E.捏力计