如图所示，一木块放在水平桌面上，在水平方向上共受到三个力即F1、F2和摩擦力作用，木

The water companies were instructed to keep the people ______ to the polluted water.

A．from exposing

B．being exposed

C．exposing

D．from being exposed

My pencil _____ in my bag.  [ ]

A. is    

B. am     

C. are

不直接参与脂代谢的酶是（）。

A.LPL

B.LCAT

C.肝脂酶

D.CK-MB

E.HMGCoA还原酶

阅读理解

      A few years ago when my daughter was about two years old,I went through a difficult time.My

marriage was in trouble,I was pregnant (怀孕的) and not particularly well and I didn't have much money.

Looking back I think I was also a bit depressed,but I had to get on with taking care of my daughter the

best I could.

      One day I thought I would take my daughter to the park for a nice day as she liked there,and I thought it was a nice thing to do.I decided to walk because the bus was expensive,so it took us a long time to get

there.When we finally got there,immediately my daughter began to cry.She was cold,she was thirsty,and

she wanted to go home.To be honest,I had not prepared properly.I didn't even have any money to buy a

drink or to take the bus back home.I was so frustrated and cross with myself that my dream of a nice day

failed.

       I started walking back home (it was nearly 2 miles),and my daughter would not stop crying.I felt so

miserable and cross with myself and my life that I started crying too.

      At that point a car stopped and a gentleman offered us a lift.He took us home,and seemed really

concerned-he even offered me all his change!The kindness of this stranger to a stranger like me really

made me feel better.I never saw him again and I don't know who he is but he really helped me out that

day,so I just want to say thank you.

1．The writer writes the passage in order to________.

A．tell us how she got through her difficult time

B．tell us what kind of life she and her daughter once lived

C．tell us a journey she and her daughter had without money

D．express her sincere thanks for the driver who once helped her

2．Why did the writer go through a difficult time when her daughter was about 2 years old?

A．Because her daughter was too young and noisy and she didn't know how to care for her.

B．Because she loved her daughter too much and took care of her as best as she could.

C．Because she was worried about her own health.

D．Because there is something wrong with her marriage,health and money.

3．What finally caused the writer to cry?

A．Her own poor situation.

B．Her feeling sorry to her daughter.

C．The lack of money.

D．The failure of her dream of a nice day.

4．According to the passage,we can infer that________.

A．the writer could afford a bus ticket at that time

B．the writer will never forget the kindness given by the driver

C．the writer received the driver's change and bought drinks for her daughter

D．the driver knew the writer and her daughter

1905年，孙中山在《民报》中阐发的三民主义不包括（）。

A．民权主义

B．民族主义

C．民生主义

D．民心主义