问题 单项选择题

有关肌紧张的叙述,错误的是

A.缓慢持续牵拉肌腱时发生
B.多突触反射
C.感受器为肌梭
D.同一肌肉不同运动单位同步紧张性收缩
E.维持机体姿势

答案

参考答案:D

解析:[解题思路] 肌紧张指缓慢和持续牵拉肌腱时发生的牵张反射。表现为受牵拉肌肉发生的不同运动单位交替性紧张性收缩,多突触反射,是维持机体姿势最基本的反射。

阅读理解

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

         A bus stopped. I got on and asked the driver how far she was going. “Ten more miles,” she said. There was another bus I could take from here. This clearly was going to be a long night.

         I got off at the end of the route and she 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 came up. There was no light number above its windshield. It was out of service, but the door opened. It was the same driver.

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

       “You will drive me home on the bus?” I asked, astonished.

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

       “It's a long way,” I insisted.

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

         As we drove from the station in the car, she began telling me a story. A few days earlier, her brother had run out of gas. A good man picked him up, took him to a service station and then back to his car.“I'm just passing the favour(善意的行为)along,”she said.

        When I offered her money as a thank-you, she wouldn’t accept. “Just do something nice for somebody. Pass it along,” she said.

1. The writer changed his mind after waiting 30 minutes because________.

A. he became impatient and a bit worried

B. a taxi ride would be more comfortable

C. he knew the driver would never return

D. the bus driver had given him wrong information

2. The bus driver drove the writer home later because _______.

A. her brother had told her to do so

B. she wanted to earn more money

C. she happened to go in the same direction

D. she wanted to do something good for others

3. The bus driver hoped that the writer_________.

A. would drive someone home      

B. would help someone in need

C. would keep her in memory        

D. would give the money to others

单项选择题