二尖瓣狭窄患者。查体：心率102次／分，心尖区触及舒张期震颤，心尖部可闻及开瓣音，心

古代西亚人建造的山岳台是作何之用的()

A．崇拜天体

B．崇拜山岳

C．观测星象

D．(A+B+C)

阅读理解。

     Scientists in Mexico have just begun a new study of one of the world's biggest pyramids: the

Pyramid of the Sun, north of Mexico City. They're putting lots of small, high-tech machines under

the pyramid to try to unlock some of its secrets. For thousands of years, people have tried to uncover

the secrets of the pyramids.

     The people who built the pyramids made lots of secret doors and rooms to stop robbers from

finding the treasures inside. However, there always have been some smart thieves in history. Now,

almost all of Egypt's pyramids have been robbed, including the Great Pyramid of Khufu, which is

the largest pyramid in the world. It is the only one of the ancient wonders of the world that is still

standing.

     In AD 820, an Arab king named Abdullah AL Manum got a group of workers to dig their way

into the Great Pyramid and have a look. Inside the pyramid, they found three rooms-the Queen's

Chamber, the Grand Gallery and the King's Chamber. But to their surprise, the men didn't find the

treasures they wanted. The Queen's and King's Chambers were both empty! Where were the King's

mummy and his treasures? Had someone already taken them away? The huge stone doors at the

pyramid's entrance were still closed when AL Manum's men went inside. How had the thieves got

in and out?

     Since then, many people have gone inside the Great Pyramid to have a look or to try to take things.

But still, no other chambers or walkways have been found.

     In 2002, an American team made the most recent visit to the Great Pyramid. Scientists sent a robot

into the pyramid, but they only found a mysterious locked stone door.

1. The first two paragraphs were written to show that ____. 

A. the Pyramid of the Sun is an unusual historic building 

B. ancient Egyptian emperors were cruel 

C. construction workers led a hard life in ancient Egypt 

D. the secrets of the pyramids remain to be uncovered

2. What is the purpose of making some secret doors to the pyramids?  _______. 

A. To try to unlock some of its secrets 

B. To stop robbers from finding the treasures inside 

C. To refuse some visitors all over the world into it 

D. To tell the truth to the people in the future

3. Which of the following is NOT true to the Great Pyramid of Khufu? ______. 

A. It is the largest pyramid in the world.   

B. It is the only one of the ancient wonders that is still standing. 

C. Abdullah AL Manum took the King's mummy and his treasures away 

D. Scientists found a mysterious locked stone door to the Great Pyramid

4. What would be the best title for the text?

A. The Pyramid of the Sun      

B. The Great Pyramid of Khufu 

C. A Mysterious Locked Stone Door  

D. Unlocking the Doors of History

人体的血液之所以呈红色，是因为（　　）

A．血液中有红色素

B．血浆中有红色素

C．红细胞中含血红蛋白

D．红细胞含铁

运行人员每十五分钟一巡视，半小时一检查，一小时（）。

变压器强油循环的冷却系统必须有（）可靠的电源，应装有自动的（），并定期进行切换试验。