学校文娱队的每位队员唱歌、跳舞至少会一项,已知会唱歌的有3人,会跳舞的有5人,现

题型:解答题

问题:

学校文娱队的每位队员唱歌、跳舞至少会一项,已知会唱歌的有3人,会跳舞的有5人,现从中选2人.设X为选出的人中既会唱歌又会跳舞的人数,且X>0的概率P(X>0)=
3
5

(1)求文娱队的人数;
(2)从文娱队中选出3人排练一个由1人唱歌2人跳舞的节目,有多少种挑选演员的方法?
考点:排列与组合
题型:解答题

阅读理解。

     Ireland has had a very difficult history. The problems started in the 16th century when English rulers

fried to conquer (征服) Ireland. For hundreds of years, the Irish people fought against the English. Finally,

in 1921, the British government was forced to give independence to the south of Ireland. The result is that

today there are two "Irelands". Northern Ireland, in the north, is part of the United Kingdom. The republic

of Ireland, in the south, is an independent country.

     In the 1840s the main crop, potatoes was affected by disease and about 750,000 people died of bunger.

This, and a shortage (短缺) of work, forced many people to leave Ireland and live in the USA, the UK,

Australia and Canada. As a result of these problems, the population fell from 8.2 million in 1841 to 6.6

million in 1851.

     For many years, the majority of Irish people earned their living as farmers. Today, many people still work

on the land but more and more people are moving to the cities to work in factories and offices. Life in the

cities is very different from life in the countryside, where things move at a quieter and slower pace.

     The Irish are famous for being warm-hearted and friendly, Oscar Wilde, a famous Irish writer, once said

that the Irish were "the greatest talkers since the Greeks". Since independence, Ireland has revived (复兴) its

own culture of music, language, literature and singing. Different areas have different styles of old Irish song

which are sung without instruments. Other kinds of Irish music use many different instruments such as the

violin, whistles, etc.

1. What does the author tell us in paragraph 1?

A. how the Irish fought against the English.

B. how Ireland gained independence.

C. how English rulers tried to conquer Ireland.

D. how two "Irelands" came into being.

2. We learn from the text that in Ireland _____.

A. food shortages in the 1840s led to a decline in population

B. people are moving to the cities for lack of work in the countryside

C. it is harder to make a living as a farmer than as a factory worker

D. different kinds of old Irish songs are all sung with instruments

3. The last paragraph is mainly about _____.

A. the Irish character

B. Irish culture

C. Irish musical instruments

D. a famous Irish writer

4. What can be the best title for the text?

A. life in Ireland

B. A Very difficult history

C. Ireland, past and present

D. the independence of Ireland

题型:解答题

骶丛的组成是()

A.L4前支一部分,L5前支,骶尾神经前支

B.L5前支,骶尾神经前支

C.骶神经前支

D.尾神经前支

E.以上都不对

题型:解答题

职位评价是以()为对象来进行的。

A、员工

B、员工能力

C、工作职位

D、其他

题型:解答题

对应ASCII码表,下列有关ASCII码值的大小关系描述正确的是

A) "CR"<"d"<"G"
B) "a"<"A"<"9"
C) "9"<"A"<"CR"
D) "9"<"R"<"n\

题型:解答题

滚动轴承的润滑油液面应加到什么位置()。

A.可随意添加

B.当转速n>3000转/分,油位应加到轴承的最下部的滚珠中心以下,但不得低于滚珠下缘

C.当转速n=1500-3000转/分,油位在轴承最下部的滚珠中心以下,但不得浸没滚珠上缘

D.当转速n<1500转/分,油位应在轴承最下部的滚珠的上缘或浸没滚珠

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