当对某种疾病或人群健康状况不明时，首先采取的研究（）。 A.队列研究 B.病例对照研

判断肩关节脱位整复成功的试验标志有（）。

A.挺胸试验阴性

B.肩外展试验阴性

C.搭肩试验阴性

D.疼痛弧试验阴性

E.肱二头肌腱反射阳性

D

A team of scientists proved that seals had a very good sense of hearing. These men trained blind seals to expect food when they heard sounds. The seals always began snapping(猛咬) when a strong signal was sounded.

It was proved that even a soft signal, a considerable distance away, could make these sea animals respond. That should make the fisherman who makes much noise while working, or talks loudly, start thinking.

The same team of scientists also trained seals to recognize different sounds. One bell-tone meant food ,two bell-tones meant no food. In the beginning, the seals made mistakes when the two bell-tones were sounded. They were given a light tap after each mistake. The seals were good learners. They easily learned to tell the difference between the sounds.

67.Why was it necessary to use blind seals? Because they______.

A. were unable to use sight for clues    B. had better hearing

C. were waiting to be fed             D. were the only animals to be found

68. To those seals strong signal meant_____.

A. snapping     B. nothing      C. food       D. a light tap

69. The article doesn’t say directly but suggests that fishermen usually think______.

A. seals have no good sense of hearing   B. seals have good sense of hearing

C. seals can only recognize bell sounds   D. seals can not hear soft or long distant sounds

70. Which title will be the best to suit the article?

A. Clever Seals                      B. Smart Learners 

C. An Underwater School             D. An Unknown School

从2011年5月1日起，备受关注的“醉驾入刑”开始正式实施，同时，对于飙车、饮酒驾车及涉牌违法等群众反映强烈的严重交通违法行为，处罚也更加严厉。观察下图《醉驾》，你认为下列说法正确的是  [ ]

A．交警应严格执法，追究违法者的责任

B．交警应网开一面，睁只眼、闭只眼

C．中国酒文化历史悠久，查醉驾必然导致酒文化衰落

D．查醉驾利民不利国，影响我国经济的快速发展

油浸式电流互感器巡视设备外观完好、无渗漏；外绝缘表面清洁、无裂纹及放电现象。

十进制数90转换成二进制数是

A．1011010

B．1101010

C．1011110

D．1011100