甲、乙两人约定上午7：20至8：00之间到某站乘公共汽车，在这段时_爱下问搜题

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问题选择题

甲、乙两人约定上午7：20至8：00之间到某站乘公共汽车，在这段时间内有3班公共汽车，它们开车的时刻分别是7：40、7：50和8：00，甲、乙两人约定，见车就乘，则甲、乙同乘一车的概率为（假定甲、乙两人到达车站的时刻是互相不牵连的，且每人在7：20至8：00时的任何时刻到达车站都是等可能的）（　　）

A．

1

3

B．

1

2

C．

3

8

D．

5

8

答案

甲、乙同乘第一辆车的概率为

1

2

×

1

2

=

1

4

，

甲、乙同乘第二辆车的概率为

1

4

×

1

4

=

1

16

，

甲、乙同乘第三辆车的概率为

1

4

×

1

4

=

1

16

，

甲、乙同乘一车的概率为

1

4

+

1

16

+

1

16

=

3

8

，

故选C．

完形填空

In one way of thinking, failure is part of life. In   26  way, failure may be a way towards success. The “Spider-story” is often   27 Robert Bruce, leader of the Scots in the 13^th century, was hiding in a cave from the English. He watched a spider  28 a web. The spider tried to reach across a rough   29 in the rock. He tried six times. On the   30  time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to   31 the English. Edison, the inventor of the light bulb, made 32 models that failed before he found the right way to make one. Once he was asked   33 he kept on trying to make a new type of battery when he had failed so often, he replied, “Failure? I have   34 failures. Now I know 50,000 ways it won't   35”.
So what? First, always think about your failure. What caused  36 ？Were conditions right? Were you in top from yourself? What can you change? So things will go   37 next times.
Second, is the goal（目标） you're trying to reach the right one? Try to do some   38 about what your real goals may be. Think about this question. “If I do succeed in this, where will it get me?" This may help you prevent failure in things you shouldn't be doing any way.
The third thing to keep in   39 about failure is that it's a part of life. Learn to “live with yourself" even though you may have   40 ．

C．defeat(打败)

D．hundreds of

填空题

一个多位数“四舍五入”后取近似值是6万，这个数最大可能是______，最小是______．