题干

在校春季田径运动会400m决赛中,前300m小明落后于小王,后100m小明加速冲刺超过了小王领先到达终点,关于这次决赛,下列说法正确的是(   )

A:前300m,小明的平均速度比小王的平均速度大

B:前300m,小明的平均速度与小王的平均速度相等

C:400m全程,小明的平均速度比小王的平均速度大

D:400m全程,小明的平均速度比小王的平均速度小

上一题 下一题 0.0难度 选择题 更新时间:2015-07-22 03:43:46

答案(点此获取答案解析)

C

同类题2

根据短文理解,完成下列各题。

      Before the spring Festival, which is the most important festival in China, millions of passengers are struggling to make the once-a-year trip home. Because of a power failure caused by snow, more than 136 trains were forced to stay in Hunan Province. Almost 150,000 passengers were stopped from going back their homes. It's reported that the losses will be 111.1 billion yuan.  

In central China's Hunan Province, one of the worst hit area, seven people have died and snow is affecting(影响) the lives of 25.22 million people in 14 cities and 112 counties across the province. Though the power supply resumed(恢复) at 4:00 p.m. Saturday, 50 trains remain stranded (滞留) between Hengyang City in Hunan and Guangzhou provinces. And in Guangzhou, an official with Guangzhou railway authorities said the number of stranded passengers in Guangzhou City alone could hit 600,000 on Monday if the situation continued.

How to solve the problems as soon as possible? In order to help the passengers meet their families and solve the traffic problems, our government do what they can. First, The Ministry of Railways Ordered 63 trains to go to Guangzhou via (通过) the Beijing-Kowloon Railway Line or Shanghai-Kunming Railway Line instead of the Beijing-Guangzhou Railway Line. Second, the ministry also organized 35 trains from Beijing, Wuhan and Nanchang cities to help transport the stranded passengers. The thirdly, Guangdong authorities sent 15 million text messages (短信)warning drivers not to take highways leading north. Some Guangzhou citizens try their best to help the stranded passengers, such as offering medicine, raising money and cooking free meals for the stranded students.

      The snow disaster(雪灾) is so terrible, but all of the Chinese and government is trying their best to succeed in beating it.