问题
选择题
一个口袋里有4个白球，5个红球，6个黄球，每个球除颜色外都相同，搅匀后随机从袋中摸出一个球，这个球是白球的概率是（ ）
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答案
共有球4+5+6=15个，白球有4个，
因此摸出的球是白球的概率为：
．4 15
故选B．
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一个口袋里有4个白球，5个红球，6个黄球，每个球除颜色外都相同，搅匀后随机从袋中摸出一个球，这个球是白球的概率是（ ）
|
共有球4+5+6=15个，白球有4个，
因此摸出的球是白球的概率为：
．4 15
故选B．
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| Dear Zhou Jun, Thank you for your letter. It's great to 1 you again. How's your study? I hope you can 2 all your exams to get into a high school. When I got your last letter, I was very 3 volunteering (志愿活动) in Ghana. So I had no time to write back. I just got back home last week. I've got so much to 4 you! It was my first time to be a volunteer. I 5 two months there, teaching in a very poor school. When I arrived, there were only six classes and three 6 ! I had my own 7 . There were twenty children in it. I could teach them anything I wanted. They love me very much. I was so 8 in Ghana. I slept in the same house with some of the children in my class. That was a (an) 9 experience for me! I'd love to 10 to Ghana in a few months to see them again. Well, good luck with your exams! Ben | ||||
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