长江、黄河都发源于 A．青海省 B．四川省 C．西藏自治区 D．湖北省

单词拼写。

1. She looked calm, but a_______ she was very nervous at the speech contest.

2. Last year people throughout the world are c_______ more about the H1N1 since it has already killed

    many people.

3. In India, people speak not only Indian but also English as their o_______ language.

4. To speak English f______, you had better practice speaking English as much as you can.

5. Your n______ country or area is the country or area where you were born and brought up.

6. Generally speaking, the e______ part of China is more developed than the west.

7. Nowadays people prefer to do sports o_______ to keep fit and enjoy fresh air.

8. You need to have a large v to understand English well, at least 5,000 words.

9. I am heartily g______ to your help and thank you again.

10. In some countries, people who d_______ with the government will be punished.

—Where is my key?  I remember _____ it on the talle.

—Oh, look. it's on the bed.[ ]

A. put                          

B. putting

C. to put                        

D. to putting

设A，B，C皆为n阶矩阵，且AB=BC=CA=E，则A²+B²+C²=______．

根据《建筑石油沥青》规定，建筑石油沥青按（）不同分为10号、30号和40号三个牌号。

A、针入度

B、延度

C、软化度

D、溶解度

嫌气发酵设备与通风发酵设备在结构方面有何区别？