下列哪些行为属于妨害社会管理的行为（）。A、收购公安机关通报寻查的赃物或者有赃物嫌疑

通常超声束在聚焦区的声强度较大，因为（）。

A.衰减较少

B.声束直径变小

C.衍射现象

D.声束直径变大

E.增益的调整

侵蚀性葡萄胎多发生在葡萄胎排空后（）

A.3个月内

B.5个月内

C.6个月内

D.7个月内

E.12个月内

Despite being tall, Michelle Obama is much smaller than she appears on television． And she seemed a little short by her surroundings in the great hall of Christchurch College as she spoke quietly without a microphone because of a technical mistake． Her audience were 40 young girls from a London state school where 50 languages are spoken．

“I remember how well-meaning but misguided people questioned whether someone with my background could succeed at an elite （精英） university,” she said． “When I was accepted, I had all kinds of worries and doubts． I wouldn’t be as well prepared as students from privileged families and I wouldn’t fit in． But you are just as capable and have just as much to offer as anyone else．”

This was Mrs． Obama’s only solo outing during the state visit and part two of an unusual relationship which she has struck up with Anderson College in Islington． Two years ago on her first visit to the UK she visited the school．

Yesterday she returned to meet the pupils but this time at Christchurch College where they were taking part in an open day run to improve Oxford’s still poor record on diversifying student intake．

Mrs． Obama was asked why she married her husband, what it was like being First Lady and when there would be a female President in the White House． Her message—which she repeated time and again—was work hard, have self-belief, and don’t be afraid to fail． It was very un-British, but rather effective． Afterwards there were hugs for everyone and a photo with her．

And watching the group of multicultural young Britons surround her among the splendor of the college building one thought stood out． Had Mrs． Obama been born in Britain, she would almost certainly not have made it to Oxford as she did to Harvard． But now—thanks in part to her—some of these children just might．

小题1:According to the passage, Michelle Obama ____________．

A．graduated from Anderson College

B．paid her first visit to the UK this time

C．was confident when she entered the college

D．came from a family without good background小题2:It is implied in the passage that these 40 young girls ____________．

A．were all from the United States

B．were students of Oxford University

C．came from different cultural backgrounds

D．stayed with Mrs． Obama because of hard work小题3:Michelle Obama thinks success may come from the following EXCEPT ____________．

A．working hard

B．believing in yourself

C．good opportunities

D．facing failure without fear小题4:What can we learn from the underlined sentence?

A．The British pupils couldn’t understand her message．

B．Her message reached the British pupils successfully．

C．Repetition is not the British way to give a message．

D．All effective messages are not conveyed in British．

有降喉作用的肌肉是（）。

A.胸骨甲状肌

B.胸骨舌骨肌

C.肩胛舌骨肌

D.甲状舌骨肌

E.下咽缩肌

在选择直流型或交流型仪表时，须根据被测量的（）性质来确定

A、电压

B、电路

C、电流

D、电阻