可治虚冷便秘的药物是A．铅丹 B．明矾 C．轻粉 D．硫黄 E．雄黄

阅读理解。

     One of nature's most remarkable effects is the mirage.  Mirrages occur when there is a great 

difference in temperature between one layer of  air in the atmosphere and the next.        

     On a hot day, light rays from the sky. hit the unusually hot air just  above pavement or sand.  

These rays bend and then continue horizontally along the line of vision, giving the illusion that a body

 of water  lies ahead.       

     Sometimes sailors in northern seas observe ships or icebergs seemingly hanging upside down in 

the sky. In this case, the warmer air lies  above cooler, denser air. The warm air above reflects the

 image of the  distant ship or iceberg, even when the same object is not seen directly  because of 

atmospheric density.       

     Between the coast of Italy and the island of Sicily lies the Strait of Messina.        

     For centuries sailors have seen there the mirage of a whole city; this  mirage is known as the fatal 

marriage (命运注定的婚姻).       

     Scientists believe that some of the flying saucers that have been reported in many parts of the 

United States were actually mirages.  When light rays are reflected at night by the warm air above

 the earth, the mirage of a lighted object appears in the sky.

1. The body of water seen ahead while driving on a hot day is a ______.                  

A. body of water                  

B. reflection of light rays from the sky                  

C. reflection of a body of water                  

D. reflection of sand

2. Sailors in northern seas have observed mirages of  ______.                 

A. bodies of water                  

B. flying saucers                  

C. ships or icebergs ahead                  

D. ships or icebergs upside down in the sky

3. Scientists believe that mirages can give a reason for ______.                 

A. none of the flying saucer reports                 

B. some of the flying saucer reports                 

C. most of the flying saucer reports                 

D. all of the flying saucer reports

下列除哪项外都可以用来区别可水解鞣质和缩合鞣质

A．溴水
B．石灰水
C．醋酸铅
D．稀酸
E．浓硫酸

男性患者，36岁。间断黏液血便8年，加重2个月。每天大便次数为5～6次，为明显血便，粪质少。辅助检查：Hb126g/L；ESR20mm/h；肠镜示直肠至肝曲黏膜明显充血、水肿，散在针尖样溃疡，黏膜质脆，触之易出血。大便潜血（++）。

该患者突然出现发热、腹痛，排便、排气停止。查体：腹膨隆，全腹压痛、反跳痛及肌紧张，肠鸣音消失。患者出现该并发症的诱因是（）。

A.钡剂灌肠

B.低钾血症

C.抗胆碱能药物的应用

D.全腹CT检查

E.肠镜检查

F.阿片类制剂的应用

流行病学的病因是指

A．存在时必定引起疾病的因素
B．对疾病发生必不可少的因素
C．疾病发生机制中的生物因素
D．使得疾病发生概率升高的因素
E．引起疾病发生的诸多因素

He was the baby with no name. Found and taken from the north Atlantic 6 days after the sinking of the Titanic in 1912，his tiny body so moved the salvage (救援) workers that they called him “our baby.” In their home port of Halifax, Nova Scotia, people collected money for a headstone in front of the baby's grave (墓), carved with the words: “To the memory of an unknown child.” He has rested there ever since.

But history has a way of uncovering its secrets. On Nov. 5, this year, three members of a family from Finland arrived at Halifax and laid fresh flowers at the grave. “This is our baby,” says Magda Schleifer, 68, a banker. She grew up hearing stories about a great-aunt named Maria Panula,42, who had sailed on the Titanic for America to be reunited with her husband. According to the information Mrs. Schleifer had gathered, Panula gave up her seat on a lifeboat to search for her five children -- including a 13-month-old boy named Eino from whom she had become separated during the final minutes of the crossing. "We thought they were all lost in the sea," says Schleifer.

Now, using teeth and bone pieces taken from the baby's grave, scientists have compared the

DNA from the Unknown Child with those collected from members of five families who lost relatives on the Titanic and never recovered the bodies. The result of the test points only to one possible person: young Eino. Now, the family sees: no need for a new grave. "He belongs to the people of Halifax," says Schleifer. "They've taken care of him for 90 years."

Adapted from People, November 25, 2002

70. The baby travelled on the Titanic with his___________.

A. mother           B. parents           C. aunt         D. Relatives

71. What is probably the boy's last name?

   A. Schleiferi         B. Eino.            C. Magda.       D. Panula.

72. Some members of the family went to Halifax and put flowers at the child's grave on Nov. 5__.

A.  1912            B. 1954           C. 2002          D. 2004

73. This text is mainly about" how______________.

A. the unknown baby's body was taken from the north Atlantic

B. the unknown baby was buried in Halifax, Nova Scotia

C. people found out who the unknown baby was

D. people took care of the unknown baby for 90 years