简述重力除尘器的工作原理。

胃溃疡穿孔（）

A.右上腹绞痛，伴压痛、黄疸，Murphy征阳性

B.脐周围阵痛，伴有压痛、肠鸣音亢进，有肠型

C.上腹压痛，板样强直，肝浊音界消失

D.上腹部胀痛，伴有胃型及拍水声

E.胸骨下持续性钝痛，腹部体征正常

Attending a university is an important part of a person’s life. Today, many people go to a university to study and train for a future job in subjects like law, medicine, or education. But the university is not a modern invention. It has a history that is over a thousand years old.

The world’s oldest university, Al-Azhar, is in Cairo, Egypt. It was first built as a mosque in A.D. 972. A few years later, learners and teachers began meeting in the mosque in “tutoring circles”. They read and talked about the subject of law. Around 988, leaders in the city of Cairo decided to create a school for higher learning and the University of Al-Azhar was founded.

At Al-Azhar, there were many university ‘firsts.’ Courses were created. The earliest ones taught at Al-Azhar were in law and religion. In a course, students read and studied with the teacher, but there was also free discussion. Often, students and teachers talked about a topic, and there was no ‘right’ answer. Finally, scholars from around the world came to Al-Azhar to teach and do research. At the university, people studied the past, but it was also a place for sharing new ideas.

Over a thousand years later, Al-Azhar is still an important university in the world. Its library contains more than 250,000 of the world’s oldest and most valuable books. Today, many of the world’s most important universities such as Oxford and Harvard still follow the traditions started at Al-Azhar.

小题1:What’s this passage mainly about?

A．The history of the world’s oldest university.

B．The importance of attending a university.

C．The relationship between university and future job.

D．The invention of a modern university.小题2: The first university was founded over _____ years ago.

A．a hundrend

B．hundreds of

C．a thousand

D．thousands of小题3:The oldest university in the world is _____.

A．Oxford

B．Cambridge

C．Harvard

D．Al-Azhar小题4: What does the underlined word “course” mean in this passage?

A. A series of lessons.                                    C. A period of time.

C. A series of actions.                                    D. A group of professors.

小题5:What’s the main idea of the last paragraph?

A．How many books are in the Al-Azhar’s library.

B．How valuable the Al-Azhar’s books are.

C．Why Oxford and Harvard still follow Al-Azhar’s pattern.

D．How Al-Azhar still holds an important role in the world.

What color do you like best? Do you like yellow, orange and red? If you do, you must be an optimist, a leader, or an active person who enjoys life, people and excitement. Do you prefer grey and blue? Then you are probably quiet, shy and you would rather follow than lead. If you love green, you are likely to be strong-minded and determined. You wish to succeed and want other people to see you are successful. At least this is what psychologists （心理学家）tell us. They have been seriously studying the meaning of color preference, and the effects that colors have on human beings. They tell us that we don’t choose our favorite color as we grow up. If you happen to love brown, you do so as soon as you open your eyes, or at least as soon as you could see clearly.

　　Black is depressing while light and bright colors make people not only happier but more active. A yellow room makes us feel more cheerful and more comfortable than a dark green one does, and a red dress adds warmth and cheer to sad winter days. It is a fact that factory workers work better, harder and have fewer accidents when their machines are painted orange rather than black or dark grey.

　　Remember, then, that if you feel low, you can always brighten your day or your life with a few colorful things. Also remember that you will know your friends (and your enemies) better when you find out what colors they like and dislike. And don’t forget that anyone can guess a lot about you when you choose a piece of handkerchief.

67. 小题1:According to the passage, men’s 110-meter hurdles Olympic champion and world record holder Liu Xiang is most likely to love the color ______.

A．black

B．grey

C．green

D．brown68. 小题2:Why are machines painted orange in some factories, according to the passage?

A．Because workers tend to prefer orange to other colors.

B．Because other colors are forbidden in factories.

C．Because less accidents happen due to the introduction of orange machines.

D．Because orange machines are easier to clean.69. 小题3:Which of the following statements is Not true according to the passage?

A．It’s possible to cheer you up by enjoying some colorful pictures.

B．You can know your friends better through the color they like or dislike.

C．Some people are born with their colorful preference.

D．One’s color preference is always changeable.70. 小题4:The underlined word ‘depressing’ in Paragraph 2 probably means ‘______’.

A．discouraging

B．happy

C．surprising

D．brave

嗜酸粒细胞减少，见于（）

A.肺炎

B.伤寒

C.败血症

D.风湿热

E.肝炎

什么是锅炉的充氮或充气相缓蚀剂保护法？