下列情形中，可以依法扣留车辆的有（）。 A.甲驾驶小汽车上道路行驶，但未放置检验合格

阅读理解。

      I had the meanest mother in the whole world. While other kids ate candy for breakfast, I had to have

porridge, eggs or toast. When others had Cokes and candy for lunch, I had to eat a sandwich. But at least

I wasn't alone when I was sad. My sister and two brothers had the same mean (刻薄的) mother as I did.

     My mother preferred to know where we were all the time. She had to know who our friends were and

where we were going. We had to clean clothes and take a bath every day. The other kids got to wear the

same clothes for days. We could not lie in bed "sick" in order to miss school. 

     The worst is yet to come. We had to be in bed by nine each night and get up at eight the next morning.

We couldn't sleep till noon like our friends. So while they slept, my mother was brave to break the Child

Labour Law. She made us work. We had to wash dishes, make beds, and learn to cook and all sorts of

things at home. I believe she lay awake thinking up all things for us to do. 

     My mother was a complete failure as a mother. Two of her children received higher education. None of

us have ever been arrested (taken away by the police) or divorced. She forced us to grow up into educated

and honest adults. I am trying to raise my three children this way. I am filled with pride when my children

call me "mean". Why? Because now I thank God every day for giving me the meanest mother in the world.

1. How many children does the writer's mother have?

A. Four.

B. Two.

C. Three.

D. Six. 

2. What can you infer (推测) from the passage?

A. My family was rich, so I ate a sandwich for lunch.

B. My mother was a great success. We love her.

C. If we didn't want to go to school, the best way was to pretend to be sick.

D. We needn't share the housework at home.

3. The best title for this passage may be _______. 

A. My childhood

B. The meanest mother

C. I do as my mother did

D. Unforgettable memories

在绘制网络图时，应注意下列（）问题。

A．两个结点之间，只能有一个活动

B．网络图可以向多个方向进行活动

C．网络图只能有一个始点和一个终点

D．任何一个结点必须既有紧前工序，又有紧后工序

如图8所示，物体A的长度为                  cm。

髋关节屈曲运动范围正常是（）

A.0°～90°

B.0°～125°

C.0°～135°

D.0°～150°

E.0°

在影响健康行为的因素中，强化因素是

A．促使某行为动机得以实现的因素

B．诱发某行为的因素

C．激励某行为的因素

D．减弱某行为的因素

E．预警某行为的因素