掘进中的煤巷，允许的最低风速为多少m/s？

"I was just like you--I’ thought I was invincible," says Adam Blomberg, standing before 400 students in a darkened auditorium at Miami’s Coral Reef Senior High School. A photo of a bloodied and unconscious teenager, a breathing tube protruding from his mouth, flashes on the wall.

"That was me," he says. There’s a collective gasp before the room grows silent and Blomberg,31, an anesthesiologist who trained at Brigham and Women’s Hospital in Boston, begins the story of what happened one night in February 1995.

He created a presentation illustrating the dangers of behaving irresponsibly in a car, from not buckling up to speeding to driving under the influence of alcohol and drugs. He tracked down photos of teen crash victims from the center’s archives, then incorporated statistics and his own experience. He spoke the first time to a local Boy Scout troop and was soon giving his talk, "A Survivor’s Story," at high schools around the state.

The Blomberg family had reason to celebrate. Adam had fully recovered and was on his way to fulfilling his lifelong dream of becoming a doctor. But in January 2000, Blomberg’s 22-year-old step-brother, Michael, was killed in a crash while driving to his Atlanta home late one night. He wasn’t wearing a seat belt. After the accident, Blomberg stopped telling his story to crowds, racked with guilt over his inability to reach Michael. If Blomberg had failed his own brother, he reasoned, how could he possibly make a difference to a roomful of strangers Requests from schools continued to roll in, but he turned down every one.

Then Blomberg got a call from a high school counselor. As he started into his standard excuse-lack of time—he looked across the room at a stack of thank-you notes from students who had heard him speak. He realized that kids needed to hear what he had to say. He agreed to visit the school and began contacting others on the waiting list for his talks.

Blomberg leaves the school hoping he has changed someone’s behavior. He recalls a letter he received from a student who heard him speak and got into a crash later that same day but was unharmed. " She told me she was wearing her seat belt because of me."

Letters like this reinforce his belief that he survived the accident for a reason. "There are a lot of physicians in the world, and we all save lives," he says. "I have a special opportunity to save lives not just as a doctor but also as a human being.\

Why did the author stop giving speeches for a while（）

A. The death of his stepbrother makes him feel guilty

B. The development of seat belt avoided most accidents

C. There are no more requests from schools inviting him

D. He did not have enough time to give lectures at that time

Mr. Smith is in London. He is    for two weeks.

A. away             B. far              C. just

早期治疗骨折的原则没有（）

A.复位

B.防止并发症

C.固定

D.功能锻炼

E.促进骨折愈合

以下关于丘墟穴主治作用的叙述，不正确的是（）

A.足下垂

B.外踝肿

C.足内翻

D.月经不调

E.颈项痛

下列哪些操作系统能够达到C2安全级别( )。 Ⅰ．Windows 3.x Ⅱ．Apple System 7.x Ⅲ．Windows NT Ⅳ．NetWare 3.x

A．Ⅰ和Ⅲ

B．Ⅱ和Ⅲ

C．Ⅱ和Ⅳ

D．Ⅲ和Ⅳ