题干

小强乘坐竖直电梯上楼过程中,他相对于地面向上的“速度v与时间t ”的图像如图甲所示,他所受电梯水平地板的“支持力F与时间t ”的图像漏画了一部分,如图乙所示。若将乙图补充完整,选项所示四个图像中可能正确的是(   )


A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2016-10-25 09:02:19

答案(点此获取答案解析)

C

同类题4

阅读理解

B

    Many blind people use guide dogs to help them get safety from place to place and to warn them of danger. But what can blind people do if they are allergic(过敏的)to dogs or just don't like them? For some people, the answer is provided by the Guide Horse Foundation.

    Janet and Don Burleson founded the organization in 1999. They began training miniature horses to help guide blind people. Miniature horses look just like regular horses, only much smaller. They are generally less than 34 inches tall.

    Cuddles was the foundation's first guide horse in full service(服务). She became 45-year-old Dan Shaw's helper. Shaw has an eye disease and his sight is very poor. One night, while filling out a form to get a guide dog, Shaw heard a news story on TV about people training horses to guide the blind. Shaw loves horses and wanted a guide animal that would live a long time. He applied(申请), and a year later, Cuddles and Shaw began training as a team.

    On a trip to New York, Cuddles helped Shaw safely tour Times Square, a very busy part of the city at night. The next day, Cuddles calmly rode the elevator with Shaw to the crowded top of the Empire State Building, a famous tall building. Cuddles even guided Shaw on the boat ride to the Statue of Liberty(自由女神像), and traveled on the subway system.

Shaw says that he is very lucky to have Cuddles. He believes that Cuddles has changed his life for the better by giving him more freedom.