科研方向在选题中具有导向、开拓以及积累的作用。

什么是迟发性运动障碍?

Last July, my 12-year-old car died on California's Santa Na Freeway. It was an hour before sunset, and I was 25 miles form home. I couldn't reach anyone to pick me up, so I decided to take a bus. Not knowing the routes, I figured I'd just head east.

A bus pulled up, and I asked the driver how far she was going. "Four more lights," she said. There was another bus I could take form there. This clearly was going to be a long night.

She dropped me off at the end of her route and told me which bus to look for. After waiting 30 minutes, I began to think about a very expensive taxi ride home. Then a bus pulled up. There was no lighted number above its wind-shield. It was out of service. But the door opened, and I was surprised to find that it was the same driver.

"I just can't leave you here, "she said. "This isn't the nicest place. I'll give you a ride home."

“You’ll drive me home in the bus?” I asked, perplexed(迷惑的).

“No, I’ll take you in my car,” she said.

“It’s a long way,” I protested(抗议).

“Come on,”she said. “I have nothing else to do.”

As we drove from the station in her car, she began telling me a story. A few days earlier, her brother had run out of gas. A good Samaritan picked him up, took him to a service station and then back to his car. “I’m just passing the favor along.”she said.

When I offered her money as a thank-you, she wouldn’t hear of it. “That would not make it a  favor,” she said. “Just do something nice for somebody. Pass it along.”

小题1:The writer thought that he would have a long night because

A．it world be long before he could take another bus

B．no driver would give him a ride

C．he didn’t know the routes

D．he perhaps would have to take a taxi小题2:Judging from its context, the place where the writer waited for the second bus was     .

A．very quiet and peaceful

B．dark without street lights

C．neither clean nor beautiful

D．a little unsafe小题3:The writer wanted to take a taxi home at the end of the route because         .

A．no bus would come

B．a taxi ride would be more comfortable

C．he became impatient and a bit worried

D．he knew the driver would never return小题4:The bus driver drove the writer home later because       .

A．she happened to go in the same direction

B．she wanted to do something good for other people

C．her brother told her to do so

D．she wanted to earn more money小题5:The bus driver hoped that the writer         .

A．world do as she did

B．would keep her in memory

C．would give the money to others

D．would do her a favor

矿井风流经过某些局部变化地段，如因突然改变了风向、风速而引起的局部风压损失称为（）。

A、摩擦阻力

B、局部阻力

C、通风阻力

截制插穗时下切口位置应在（ ）。

A．侧芽上0.5cm

B．侧芽处

C．侧芽下0.5cm

D．随意

细粉可以全部通过几号筛（）

A.2号

B.4号

C.5号

D.6号

E.8号