问题 解答题

有两张卡片,第一组三张卡片上分别写着A,B,C;第二组五张卡片上分别写着A,B,B,D,E.试求出每组卡片中各抽取一张,两张都是B的概率______.

答案

列表得:

∴一共有15种情况,两张都是B的有2种情况,

∴P(B,B)=

2
15

故答案为

2
15

阅读理解

阅读下面短文,根据短文内容回答下面问题。

     Li Mei's friends sent her some postcards from different countries. 

                                                     

Dear Li Mei,

     I got to the UK two days ago. On my first day I went to Buckingham Palace (白金汉宫). Yesterday

I walked around the British Museum. It's very big and my legs were tired, but I saw some great things! 

                                                                                                                                      Love,

                                                                                                                                     Xiao Jian 

                                                           

Dear Li Mei,

     I am in Australia. It's winter for you,but it's summer here. Every morning I go swimming in the warm

sea (海洋), then I go to Chinese restaurant. In the afternoon I walk round shops and buy presents (礼物). 

                                                                                                                                       Love,

                                                                                                                                       Luo Ying 

                                                        

Dear Li Mei,

     I am in San Francisco. My uncle met me at the airport. Yesterday we did a lot of sightseeing and took

a lot of photos. I bought some clothes. Next week we are going to Hollywood. I'm having a very good time.

                                                                                                                                       Best wishes,

                                                                                                                                       Peng Hui 

                                                        

Dear Li Mei,

     I am now on vacation in South Africa. It is very hot. I went to national park and saw lions and elephants.

This is a wonderful country.

                                                                                                                                              Yours,

                                                                                                                                              Li Lan

1. Xiao Jian saw some great things in ___________.

2. It's ___________ in Australia.

3. Peng Hui went sightseeing in San Francisco with his ___________.

4. Peng Hui is going to ___________ next week.

5. Li Lan saw ___________ in a national park.

单项选择题