问题 选择题

下列说法中正确的是(  )

A.通过多次试验得到某事件发生的频率等于这一事件发生的概率

B.某人前9次掷出的硬币都是正面朝上,那么第10次掷出的硬币反面朝上的概率一定大于正面朝上的概率

C.不确定事件的概率可能等于1

D.试验估计结果与理论概率不一定一致

答案

A、错,应为:多次试验得到某事件发生的频率可以估计这一事件发生的概率;

B、错,反面朝上的概率仍为0.5;

C、错,概率等于1即为必然事件;

D、正确.

故选D.

阅读理解

阅读理解。

    Once upon a time there was a poor man. He had an orange tree in his garden. On the tree there were

many oranges. One day he found one of his oranges was much bigger than the others. It was as big as

a football. Nobody had seen such a big orange. The poor man took the orange to the King. The King was

so pleased that he gave the man a lot of money for it.

    When a rich man heard of it, he said to himself, "It's only an orange. Why did the King give so much

money for it? I'll take my gold cup to the King. He'll give me more money." 

    The next day when the King received the gold cup, he said to the rich man. "What a beautiful cup! I'll

show you something wonderful. Please take this great orange."

1. The poor man had an orange tree ______. [ ]

A. beside his garden

B. outside his garden

C. in front of his house

D. in his garden

2. The poor man was surprised to see ______ a football. [ ]

A. all the oranges on the tree were like

B. one of his oranges was as big as

C. what was on his tree was

D. some of his oranges were like

3. Why did the poor man take the biggest orange to the King? [ ]

A. Because the King had never seen such a big orange.

B. Because he could sell the orange to the King.

C. Because the King liked to eat the big orange.

D. Because he liked the King.

4. The rich man took his gold cup to the King. He thought ______. [ ]

A. the King would give him the biggest orange

B. the King would give him a new house

C. he could get much more money than the poor man

D. the King would give him lots of oranges

5. At last the King gave the rich man ______.[ ]

A. what he wished to get

B. a lot of money that he expected

C. the biggest orange

D. another gold cup

选择题