题干

式子x2﹣y2
a
-
b
2
,﹣3,
n
+
1
m
中是整式的有(  )

A:1个

B:2个

C:3个

D:4个

上一题 下一题 0.0难度 选择题 更新时间:2017-02-24 04:39:26

答案(点此获取答案解析)

C

同类题2

阅读下面文章,完成相关问题。

奇遇

       1982年秋天,我从保定回高密东北乡探亲。因为火车晚点,车抵高密站时,已是晚上九点多钟。

       穿过铁路桥洞后,我没走柏油路。因为柏油公路拐直角,要远好多。我斜刺里走上那条废弃数年的斜插到高密东北乡去的土路。路面上杂草丛生,路两边全是庄稼地,有高粱地、玉米地、红薯地等,月光照在庄稼的枝叶上,闪烁着微弱的银光。路越往前延伸庄稼越茂密,县城的灯光早就看不见了。除蝈蝈的叫声之外,庄稼地里偶尔也有鸟或什么小动物的叫声:我忽然感觉到脖颈后有些凉森森的,听到自己的脚步声特别响亮与沉重起来。我有些后悔不该单身走夜路,与此同时,我感觉到路两边的庄稼地里有无数秘密,有无数只眼睛在监视着我,并且感觉到背后有什么东西尾随着我,月光也突然朦胧起来。我的脚步不知不觉地加快了。越走得快越感到背后不安全。终于,我下意识地回过头去。

       我的身后当然什么也没有。但依然浑身紧张、牙齿打战,儿时在家乡时听说过的鬼故事“连篇累牍”地涌进脑海:一个人走在路上,突然听到前边有货郎挑子的嗄吱声,细细一看,只见到两个货挑子和两条腿在移动,上身没有……一个人走夜路碰到一个人对他嘿嘿笑,仔细一看,是个女人,这女人脸上只有一张红嘴,除了嘴之外什么都没有,这是“光面”鬼……一个人走夜路忽然看到一个白胡子老头在吃青草……

       我的冷汗一直流着,把衣服都溻(tā)湿了。

       我高声唱起歌来:“向前向前向前﹣﹣杀﹣﹣”

       自然是一路无事。临近村头时,天已黎明,东边天上一片红晕,村里的雄鸡喔喔地叫着,一派安宁景象。回头望来路,庄稼是庄稼道路是道路,想起这一路的惊惧,感到自己十分愚蠢可笑。世界本无事,庸人自扰之!

       正欲进村,见树影里闪出一个老人来,定睛一看,是我的邻居赵三大爷。他穿得齐齐整整,在离我三五步处站住了。我忙问:“三大爷,起这么早!”

       他说:“早起进城,知道你回来了,在这里等你。”

       我跟他说了几句家常话,递给他一支带过滤嘴的香烟。点着了烟,他说:“老三,我还欠你爹五元钱。我的钱不能用,你把这个烟袋嘴捎给他吧,就算我还了他钱。你快回家去吧,爹娘都盼着你呢!”

       我接过三大爷递过来的冰冷的玛瑙烟袋嘴,匆匆跟他道别,便急忙进了村。

       回家后,爹娘盯着我问长问短,说我不该一人走夜路,万一出点什么事就了不得。我打着哈哈说:“我一心想碰到鬼,可是鬼不敢来见我!”

       母亲说:“小孩子家嘴不要狂!”

       父亲抽烟时,我从兜里摸出那玛瑙烟袋嘴,说:“爹,刚才在村口我碰到赵三大爷,他说欠你五元钱,让我把这个烟袋嘴捎给你抵债。”

       父亲惊讶地问:“你说谁?”

       我说:“赵家三大爷呀!”

       父亲说:“你看花了眼了吧?”

       我说:“绝对没有,我跟他说了一会儿话,还敬他一支烟,还有这个烟袋嘴呢!”

       我把烟袋嘴递给父亲,父亲竟犹豫着不敢接。

       母亲说:“赵家三大爷大前天早晨就死了!”

﹣﹣选自《莫言文集》,有删改

同类题4

阅读理解

    According to sociologists(社会学家), every modern industrial society has some form of social stratification(阶层). Class, power and status are important in deciding people's rank in society.

    Class means a person's economic position in society. A commonly used classification is lower class, middle class and upper class. While sociologists disagree on how these terms should be exactly defined, they do describe societies like the United States quite well. One study shows that 53% of Americans belong to the lower class, 46% the middle class, and 1% the upper class. Interestingly, a surgeon earning $500,000 a year and a bus driver earning $50,000 a year both regard themselves as the middle class!

    Power refers to the amount of control a person has over other people. Obviously, people in positions of great power (such as governors) exercise(行使)big power, but people who take orders from others have less power. Power and class do not always go hand in hand, however. For example, the governor of a state has great power, but he or she may not belong to a corresponding (相应的)economic class. Generally, however, there is a relationship between power and class. To our knowledge, there aren't too many people who aren't millionaires in the U.S. Senate!

    Status is the honor or respect attached to a person's position in society. It can also be affected by power and class, but not necessarily so. For example, a university professor may have a high status but not belong to a high social class or have a lot of power over others.