下列血管中都含有动脉血的是 A．肺动脉和主动脉 B．肺静脉和主动脉 C．上腔静脉

阅读理解。

     David Brenner came from a poor family. When he finished his school, he was given a wonderful

present. "Some of my friends got new clothes and a few rich boys even got new cars. "he remembered,

"My father reached into his trousers pocket and took something out, I held out my hand, and he let my

present drop into it —— a nickel!"

     "Dad said to me, Buy a newspaper with that. Read every word of it. Then turn to the classified section

and get yourself a job. Get into the world. It’s all yours now!" 

     "I always thought that was a great joke my father had played on me until a few years later when I was

in the Army, sitting in a foxhole, and thinking about my family and my life. It was then that I came to know

that my friends had got only new cars, or only new clothes. My father has given me the whole world.

What a great present!"

  1. What did David get as a present when he left school?

    A. New clothes

    B. A new car

    C. Something nice

    D. A nickel.

  2. David's father asked him to read the newspaper to _____. 

    A. find interesting stories

    B. find himself a job

    C. know what happened in the world

    D. learn more things in it

  3. Some years went by and David became a _____.

    A. doctor

    B. teacher  

    C. soldier

    D. driver

  4. In the end David understood the present his father gave him was _____.

    A. great

    B. unimportant  

    C. beautiful

    D. useless

由2x-2.4=0.32得x=1.36，这个过程叫做[ ]

A．解方程

B．方程

C．方程的解

支气管舒张剂中最常用的是()。

A．β₂受体激动剂

B．糖皮质激素

C．抗胆碱能药物

D．茶碱类

E．肥大细胞膜稳定剂

2003年，国家质量监督检验检疫总局对实木地板产品质量进行了监督抽查。共抽查了浙江、江苏、上海、广东、北京等5个省、直辖市46家企业生产的46种产品，合格35种，产品抽样合格率为（）。

A.86.1%

B.76.1%

C.76.3%

D.56.1%

电力企业执行的两票是指（）和操作票。