口腔保健咨询时，对于第二恒磨牙窝沟封闭的适宜时间，杨大夫是这样回答家长的（） A.7

如图所示，在匀速转动的水平圆盘上，沿半径方向放着用细线相连的质量相等的两个物体A和B，它们与盘面间的动摩擦因数相同，当圆盘转动到两个物体刚好还未发生滑动时，烧断细线，则以后两个物体的运动情况是（设最大静摩擦力等于滑动摩擦力） 

A．两物体沿切向方向滑动

B．两物体均沿半径方向滑动，离圆盘圆心越来越远

C．两物体仍随圆盘一起做圆周运动，不发生滑动

D．物体B仍随圆盘一起做匀速圆周运动，物体A发生滑动且离圆盘圆心越来越远

采用一条绳倒牛法保定牛时，胸环应经过　　

A．颈部

B．肩关节

C．髋结节前

D．肩胛骨后角

E．肩胛骨前角

信托公司设立集合信托计划，单个信托计划的自然人人数不得超过50人，但单笔委托金额在（）万元以上的合格投资者和机构投资者数量不受限制。

A、100

B、150

C、200

D、300

Our listener question this week comes from Abdullahi Farah, who wants to know about the life and work of Doctor Benjamin Carson.

Doctor Carson is an internationally recognized doctor at Johns Hopkins Hospital in Baltimore, Maryland. He has been the director of Pediatric Neurosurgery at the hospital for twenty-five years. At the age of thirty-three, he became one of the youngest doctors in the United States to hold that position. And he was the first African-American to have that position at Johns Hopkins Hospital.

Ben Carson is known for his work as a brain surgeon for children. For example, in nineteen eighty-seven, he led a team of seventy doctors and nurses in an operation to separate two babies joined at the head. Earlier attempts by other surgeons on other babies had failed. Doctor Carson successfully performed the operation. Both babies were able to survive independently.

Doctor Carson has written four books. His first book, "Gifted Hands," tells the story of his life. Benjamin Carson was born in nineteen fifty-one in Detroit, Michigan.

As a boy, Ben was not a good student. In fact, he was the worst in his class. When his mother learned of his failing grades she asked her sons to read two library books every week. She limited the amount of time they watched television. And she told them to respect every person.

Ben Carson soon became the top student in his class. He went on to study at Yale University, one of the best universities in the country, and later to medical school at the University of Michigan.

Doctor Carson has received many awards and honors. Last year he received the nation's highest civilian honor. Former President George W. Bush presented Benjamin Carson with the Presidential Medal of Freedom at a ceremony at the White House.

小题1:The passage is probably taken from _____.

A．a radio

B．a magazine

C．TV

D．a paper小题2:What does the word “surgeons” in paragraph 3 mean?

A．nurses

B．doctors

C．hospitals

D．points小题3:Benjamin Carson’s change in study was largely because of ______

A．his hard work

B．his teacher

C．his mother

D．his father小题4:What’s the aim to write the passage?

A．To call on us to learn from Benjamin Carson.

B．To praise Benjamin Carson for his achievements.

C．To show us how Benjamin Carson succeeded

D．To introduce Benjamin Carson’s life and work

设备监理工程师履行设备工程监理合同时，因授权不明给承包方造成损失，由()承担责任。

A．监理单位

B．业主

C．监理单位和业主

D．设备监理工程师