10月6日,瑞典皇家科学院宣布,美国科学家理查德•赫克和日本科学家根岸英一及铃木

题型:选择题

问题:

10月6日,瑞典皇家科学院宣布,美国科学家理查德•赫克和日本科学家根岸英一及铃木章共同获得今年的诺贝尔化学奖.赫克、根岸英一和铃木章通过实验发现,碳原子会和钯原子连接在一起,进行一系列化学反应.这一技术让化学家们能够精确有效地制造他们需要的复杂化合物.氯气(Cl2)和氧气(O2)都是活泼的非金属单质,在一定条件下它们都能跟甲烷(CH4)反应.已知O2和CH4充分反应后的生成物是CO2和H2O,由此推断Cl2和CH4充分反应后的生成物是(   )

A.CCl4和HCl

B.CCl4和H2

C.CH2C12和H2

D.C和HCl

考点:甲烷
题型:选择题

镁条在空气中燃烧后,生成物的质量比原来镁条的质量增大,有人说该反应不遵循质量守恒定律.此说法正确吗?为什么?

题型:选择题

When a 13-year-old Virginal girl started sneezing, her parents thought it was merely a cold. But when the sneezes continued for hours, they called in a doctor. Nearly two months later the girl was still sneezing, thousands of times a day, and her case had attracted worldwide attention.

Hundreds of suggestions, ranging from “put a clothes pin on her nose” to “have her stand on her head” poured in. But nothing did any good. Finally, she was taken to Johns Hopkins Hospital where Dr. Leo Kanner, one of the world’s top authorities on sneezing, solved the baffling (难以理解的) problem with great speed.

He used neither drugs nor surgery for, curiously enough, the clue for the treatment was found in an ancient superstition(迷信) about the amazing bodily reaction we call the sneeze. It was all in her mind, he said, a view which Aristotle, some 3,000 years earlier, would have agreed with heartily.

Dr. Kanner simply gave a modern psychological interpretation to the ancient belief that too much sneezing was an indication that the spirit was troubled; and he began to treat the girl accordingly.

“Less than two days in a hospital room, a plan for better scholastic and vocational(职业的) adjustment, and reassurance about her unreasonable fear of tuberculosis(肺结核) quickly changed her from a sneezer to an ex-sneezer,” he reported.

Sneezing has always been a subject of wonder, awe and puzzlement. Dr Kanner has collected thousands of superstitions concerning it. The most universal one is the custom of begging for the blessing of God when a person sneezes— a practice Dr. Kanner traces back to the ancient belief that a sneeze was an indication that the sneezer was possessed of an evil spirit. Strangely, people over the world still continue the custom with the traditional, “God bless you” or something else.

When scientists look at the sneeze, they see a remarkable mechanism(身体机制) which, without any conscious help from you, takes on a job that has to be done. When you need to sneeze you sneeze, this being nature’s clever way of getting rid of an annoying object from the nose. The object may be just some dust in the nose which nature is trying to remove.

51. The girl sneezed continuously because she __________.

A. was ill                                B. was mentally ill

C. had heavy mental burden                 D. had attracted world-wide attention

52. When the girl began to sneeze continuously, ___________.

A. a lot of people offered their advice

B. she was taken to John Hopkins Hospital

C. she was given a treatment found in ancient superstition

D. many doctors treated her in different ways

53. Dr. Kanner cured the girl by ___________.

A. using Aristole’s method                   B. giving her psychological treatment

C. practicing superstition                    D. treating her tuberculosis

54. When a person sneezes, we say “God bless you” because____________.

A. it’s a tradition                           B. the person is possessed of an evil spirit

C. the person is ill                          D. God will bless those who sneeze

55. According to scientists, people sneeze because _____________.

A. they are ill                              B. to sneeze is human nature

C. they do not need any conscious help         D. there are unwanted things in their noses

题型:选择题

哪项不是肺动脉瓣狭窄的X线表现()

A.肺纹理减少

B.肺动脉总干凸出

C.右室增大

D.右房增大

E.左房增大

题型:选择题

老年男性,反复咳喘5~6年,今年入冬以来病情加重,咳嗽喘逆,夜间不得卧,咳痰色白,清稀量多,冷空气刺激加重,易患感冒,常兼恶寒,肢冷,舌苔白滑,脉弦紧。其中医治法是

A.宣肺散寒,化痰止咳
B.清热解表,止咳平喘
C.燥湿化痰,降气止咳
D.清热化痰,宣肺止咳
E.温肺化饮,散寒止咳

题型:选择题

请简要回答办理贷款业务的基本流程?

更多题库