问题 单项选择题

有5对夫妇参加一场婚宴,他们被安排在一张10个座位的圆桌就餐,但是婚礼操办者并不知道他们彼此之间的关系,只是随机安排座位。问入座后每位来宾与邻座性别不同的概率是()

A.不超过1‰

B.超过1%

C.在5‰到1%之间

D.在1‰到5‰之间

答案

参考答案:C

解析:

10人随机进行环形排列有A99种。每位来宾与邻座性别不同,可将5名男性环形排列,有A44种,然后将5名女性插入5名男性形成的5个空位里,有A55种,因此一共有A44A55种排法,概率为,在5‰到1%之间。

完形填空

完成句子(共10小题;每小题2分,满分20分)

小题1:Something terrible ___________________ if Tom wasn’t coming to eat in his restaurant as he always did. (happen)

要是汤姆不像往常那样到他的餐馆来吃饭,一定是发生了什么可怕的事。

小题2:So whether life will continue on the earth for millions of years to come will depend on ______________. (solve)

所以,在未来的数百万年中,生命能否在地球上延续取决于这个问题能否得到解决。

小题3:It is hard work as well as determination _________________________. (lead)

努力工作和决心使得他成功。

小题4:__________________, I will be right here waiting for you. (be)

无论你在哪里,我都会在这里等你。

小题5:My brothers can’t attend the party__________________ at Tom’s house at present, because he is preparing for his examination. (hold)

我的哥哥不能参加此刻正在汤姆家举行的晚会,因为他正在为考试做准备。

小题6:People may __________________ that Charlie was taught to sing as soon as he could speak and dance as soon as he could walk. (find)

人们可能会感到惊奇,查理刚会说话时大人就教他唱歌,他刚会走路时大人就教他跳舞了。

小题7:My teacher told us that ____________ would win us more friendships and bring us more chances. (modest)

老师告诉我们,谦虚会为我们赢得更多的友谊并给我们带来更多的机会。

小题8:A large number of people _____________ the importance of the environmental protection up to now. (realize)

如今,许多人已经意识到了环境保护的重要性。

小题9:______________, this kind of pear was soon sold out at the market. (taste)

口味甜,这种梨很快在超市里销售一空。

小题10:The fact ______________________as his brother made it necessary for him to lose weight. (twice)

他是他哥哥的两倍重,这个事实使得他有必要减肥。

单项选择题