对于（）,没有造成损害的,应当免除处罚;造成损害的,应当减轻处罚。

已知一个整数序列A=(a0，a1，…，an-1)，其中0≤ai＜n(0≤i＜n)。若存在ap1=ap2=…=apm=x且m＞n/2(0≤pk＜n，1≤k≤m)，则称x为A的主元素。例如A=(0，5，5，3，5，7，5，5)，则5为主元素；又如A=(0，5，5，3，5，1，5，7)，则A中没有主元素。假设A中的n个元素保存在一个一维数组中，请设计一个尽可能高效的算法，找出A的主元素。若存在主元素，则输出该元素；否则输出-1。要求：

给出算法的基本设计思想。

     Parents have to do much less for their children today than they used to do, and home has become

much less of a workshop. Clothes can be bought ready made, washing can go to the laundry, food can

be bought cooked, canned or preserved, bread is baked and delivered by the baker, milk arrives on

the doorstep, meats can be had at the restaurant, the work's canteen, and the school dining-room.

     It is unusual now for father to pursue his trade or other employment at home, and his children rarely,

if ever, see him at his place of work. Boys are therefore seldom trained to follow their father's

occupation, and in many towns they have a fairly wide choice of employment and so do girls. The young

wage-earner often earns good money, and soon acquires a feeling of economic independence. In textile

areas it has long been customary for mothers to go out to work, but this practice has become so

widespread that the working mother is now a not unusual factor in a child's home life, the number of

married women in employment having more than doubled in the last twenty-five years. With mother earning and his older children drawing substantial wages father is seldom the dominant figure that he still was at the beginning of the century. When mother works，economic advantages accrue, but children lose something of great value if mother's employment prevents her from being home to greet them when they return from

schoo1. 

1. The writer mentions home as workshop because            .

A. fathers often pursue employment at home

B. parents had to make food and necessity themselves for their daily-life

C. many families produce goods at home for sale

D. both fathers and mothers in most families are workers

2. The word "accrue" in the sentence "When mother accrue," is  closest in meaning to           .

A. change    

B. dwindle    

C. double

D. increase

3. The chief reason that boys are seldom trained to follow their father's occupation is _______.

A. that children nowadays rarely see their fathers at their place of work

B. that fathers do not like to pursue employment at home any more

C. that there is a wide choice of employment for children

D. that children also like to have jobs outside

某一个DNA分子中含有30%的G+C，则由它转录成的RNA中G+C应为（）

A、60%

B、30%

C、20%

D、15%

多目标分析方法的英文缩写是（）。

A．CBA

B．RBA

C．MCA

D．CEA

由于气候、地貌、土壤、水文等自然条件和利用状况的差异形成了各类（）。

A、土地类型

B、土地潜力类型

C、土地利用类型

D、土地结构类型