问题 解答题

(1)某厂产品的次品率为0.02,问“从该厂产品中任意抽取100件,其中一定有2件次品”这一说法对不对?为什么?

(2)一次抽奖活动中,中奖的概率为0.3,试解释该概率的含义;

(3)某种病治愈的概率为0.3,那么,现有10人得这种病,在治疗中前7人没有治愈,后3人一定能治愈吗?

答案

解:(1)这种说法不对。因为“产品的次品率为0.02”是指产品为次品的可能性为2%,所以从该厂产品中任意抽取100件,其中可能有2件次品,而不是一定有2件次品。

 (2)该概率说明参加抽奖的人中有30%的人可能中奖,也就是说,若有100人参加抽奖,大约有30人可能中奖。

 (3)如果把治疗一个病人作为一次试验,“治愈率为0.3”是指随着试验次数的增加,即随着治疗人数的增加,大约有30%的人能够治愈,对于一次试验来说,其结果是随机的,因此前7人没有治愈是有可能的,对于后3人来说,其结果仍然是随机的,即有可能治愈,也有可能不能治愈,所以后3人不一定能治愈。

完形填空

One fine winter day some ants were working in the field. They were very busy. Just then a grasshopper(蚱蜢)passed by." Good day, kind ants(蚂蚁)," said the grasshopper. "I am very hungry. Won't you lend me a little food? (A)我没有东西吃了。 I will pay you before the next autumn. "  "Don't you have food of your own? (B)Why didn't you gather any food during the summer? You know there was much food in the field during the summer. What were you doing then?" asked an old ant. The grasshopper answered, "I (C)          (sing) all day and night during the summer. And so I had no time to gather any food. Please lend me some food. "Well, then," said the ant."(D)         You only played and did not work during the summer. We'll never lend you any food. "(E) And the ants went on working.

小题1: 将(A)处画线句子翻译成英语。                                     .

小题2: 写出(B)处画线句子的同义词。                                   ?

小题3:根据上下文及括号里的提示可知在(C)处应填入的是                  .

小题4:从下列句子中选择合适的句子填入文中(D)处。                      .

A. You sang very well and we all liked your songs very much.

B. You could sing all the summer and you also could dance all the winter.

C. You are one of the best singers here and we cheer you.

D. Would you like to perform one for us?

小题5:将(E)处画线句子翻译成汉语。                                   .

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