问题
选择题
一个袋中有10个小球，其中红球有4个，白球有6个，则从中摸出一球，既不是红球，也不是白球的概率是（ ）
|
答案
根据题意，知
该事件是不可能事件，则概率是0．
故选D．
搜题请搜索小程序“爱下问搜题”
一个袋中有10个小球，其中红球有4个，白球有6个，则从中摸出一球，既不是红球，也不是白球的概率是（ ）
|
根据题意，知
该事件是不可能事件，则概率是0．
故选D．
| 完形填空。 | ||||
| My teacher Miss Benson was the kindest creature on the earth. I was going to marry her when I grew up- 1 she would wait. I couldn't bear to miss one precious moment of her presence by 2 the classroom. I always raised my hands when she called for volunteers to gather 3 and bring them to her desk. That was the best chore of all. It made 4 getting near enough to her. I would arrange and rearrange the papers until they were in perfect order. I started begging my mother to put extra fruit 5 my lunch. I was never brave enough to hand it to Miss Benson directly, though. Each day the fruit was put unobserved on her desk. And the 6 was always the same. She would come in and sit down. "How nice!" She would pick the fruit up, then 7 the room. "What thoughtful little child brought me this?" No one claimed the honor, let alone me. " 8 it be that I have a secret admirer?" she would ask. I would feel the red rising in my face, and I would sigh with 9 when Miss Benson put the fruit away and started the lesson. One morning, the class was excited. The next day was Miss Benson's birthday. My heart beat fast I could give her something 10 . That afternoon was spent searching for wild flowers. I found several kinds. The next morning I hung back as others presented their gifts. 11 I went to the desk and gave the flowers to Miss Benson. She was pleased, and held it to 12 cheek for a moment. The next Monday, Miss Benson was not in class. Then I was 13 to go to the headmaster's office. When I arrived, I saw my mother. On a table were my flowers. "Do you know 14 Miss Benson is today?" the headmaster asked. " 15 , sir," I answered. "Miss Benson," he said. "is in the hospital, and you sent her there!" I sat, 16 , in my chair. "Do you know what you gave her?" he continued. I 17 , "some flowers." "They were poisonous!" He was angry. "How did you protect 18 when you picked them?" "I didn't know they were poisonous." I cried. I begged my mother to take me to the hospital. Miss Benson was in bed when we arrived. "I didn't 19 to make you sick…" I said. Miss Benson smiled, "You wanted to give me something special, didn't you?" I was filled with happiness. She was not mad at me."And I'll tell you a secret," she continued. "When I am married, if I have a 20 , I would like him to grow up just like you." | ||||
|