用8个球设计一个摸球游戏，使摸到白球与摸不到白球的可能性一样_爱下问搜题

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问题选择题

用8个球设计一个摸球游戏，使摸到白球与摸不到白球的可能性一样大，摸到红球的可能性比摸到黄球的可能性大，则游戏设计中白、红、黄球的个数可能是[ ]

A．4，2，2

B．3，2，3

C．4，3，1

D．5，2，1

答案

答案：C

完形填空

After finishing shopping in the supermarket, I and my wife Julie stood in the shortest line.
There was only one guy in it, but he was in a   31  and there seemed to be some trouble going on.
Well, I and my wife Julie stepped in behind him. At first, he seemed to be having 32 getting his groceries onto the conveyor belt. But after a while, I realized that what he was actually doing was  33  them into two parts. I offered to help, but he and the checkout lady had it 34 He asked Julie if she would mind   35  his empty basket away. Then he   36  for his wallet which was in a pocket on one side of his wheelchair. The way he was positioned and the fact that he had only one   37  arm made this quite a stretch for him, so I helped there.
What must it be like, I wondered, to be so 38   on other people like that.9 The checkout operator came around and gave him his   39  and the items he needed. She   40  one bag of groceries over a handle at the back of his chair. I   41  to get the. bigger bag and he said, "No. 42 you could do me a favor. Take that part along to the entrance and give it to Angela. " I dutifully did that,   43  Julie with our shopping. It 44 that Angela was collecting food for people who might otherwise go hpngry!
This guy, despite the 45 that his physical condition imposed on him, had   46  more than twice as much shopping as he needed and   47 the bigger bag to help other people! He didn't let the fact that he needed help 48  him from being a help. He may have been limited 49 , bat his heart was more than capable of 50 all that. And it changed my idea of dependenee.

A．under order

B．under control

C．under discussion

D．under repair

A．comfortable

D．considerate

D．associating

C．limitations

A．thrown away

B．economically

A．accomplishing

B．overlooking

填空题

设备维护保养制度的仪表四率是指：（）、（）、（）、（）。