题目

下列各元素原子排列中，其电负性减小顺序正确的是（    ） A.K＞Na＞Li                                  B.F＞O＞S              C.As＞P＞N                                   D.C＞N＞O 答案：思路点拨：比较元素电负性大小时，先确定元素在周期表中的位置关系，然后利用同周期或同主族电负性递变规律比较元素电负性大小。选项A中元素电负性K＜Na＜Li，B中F＞O＞S，选项C中As＜P＜N，选项D中C＜N＜O，所以选B项。答案：BOne night about nine o’clock, Dr. Eyck, a surgeon, had a phone call from Dr. Haydon at the hospital in Clens Falls. The surgeon was asked to go there at once to operate on a very sick boy who shot himself while playing with a gun.The doctor was soon on his way to Clens Falls. It was 60 miles away. And it was snowing heavily in the city. The surgeon thought he could get there before 12 o’clock.A few minutes later, the doctor was stopped by a man in an old black coat. Gun in hand, the man ordered the doctor to get out. Then the man drove the car down the road, leaving the doctor in the falling snow.It was after 2 o’clock in the morning when the doctor arrived at the hospital in Clens Falls. Dr. Haydon told him that the boy had died an hour before.The two doctors walked by the door of the hospital waiting room. There sat the man in the old black coat with his head in his hands.“Mr. Cuninghan,” said Dr. Haydon to the man, “This is Dr. Eyck. He is the surgeon who walked all the way from Albany to save your boy.”【小题1】Dr. Haydon asked Dr. Eyck to come to Clens Falls because _____.A．Dr. Eyck knew the boy was wounded by a shotB．The boy needed the help of a surgeonC．Dr. Eyck was the boy’s fatherD．Dr. Eyck was Haydon’s friend【小题2】The surgeon was late because ________.A．he was stopped by the policeB．the weather was rather terribleC．Clens Falls was too far from AlbanyD．his car was taken away【小题3】Choose the right order of the following events given in the story. a. Dr. Eyck was asked to come to the hospital in Clens Falls.b. Dr. Eyck arrived at the hospital.c. The boy shot himself.                    d. The boy died.e. The man in an old coat reached the hospital.  f. Dr. Eyck was robbed of his car.A．c, e, f, a, b, dB．a, c, f, d, b, eC．c, a, f, e, d, bD．a, c, f, e, d, b【小题4】The boy could have been saved if ______.A．he had not been sent to the hospitalB．his father hadn’t arrived in timeC．Dr.Eyck had arrived earlier than the manD．Dr. Eyck had arrived there two hours earlier