当牙本质因磨损、龋病暴露时，则造牙本质细胞受到程度不等的（）。造牙本质细胞将发生（）

As I was finishing the seventh grade, my school met some financial(财务的) problems. The school made the classes bigger, so there would be fewer    小题1:   (教师).

Sadly, I found out that    小题2:   (无一人) of my close friends were in any of my new classes. Also, my new classmates were quite different f 小题3:    my old ones. I began to feel lonely.

Soon I got to    小题4:   (知道) that people in other groups made new friends in their new classes. They    小题5:   (似乎) very happy with their new friends.

I thought that i 小题6:    was time for me to make new friends. I noticed that people with many friends were very    小题7:   (积极的). They often talked to others first, while I was t 小题8:    frightened to talk to others and hoped other people would talk to me first.

So I decided to c 小题9:  . Once I realized that, I found that making friends is very easy i 小题10:    you can respect(尊重) others and talk to them first. Now I feel a lot happier because I have more friends.

--When _________ the training course begin?

--Next Monday.

A．has

B．is going to

C．does

D．did

下面程序的输出结果为______。#include＜string.h＞main(){charP[17]="abc"="ABC".STR[50]="xyz";strcpy(str,strcat(p1,p2));printf(%s,str);}

A．xyzabcABC

B．abcABC

C．xyzabc

D．xyzABC

2010年4月17日7时49分，青海省玉树藏族自治州玉树县发生7．1级地震，给当地人民群众生命财产造成严重损失。地震发生后，党中央国务院及时统一布署，全国各地迅速投入了抗震救灾。各族同胞互救互助，凝聚了中 * * 大家庭的血脉亲情，描绘了一幅幅气壮山河的抗震救灾图。 这一切表明[ ]

①青海地区地震多 

②在我国，藏族比其它民族更重要 

③在我国，五十六个民族是一家 

④“一方有难，八方支援”是中 * * 的优良传统

A．①②   

B．②③   

C．③④   

D．②④

国家电监会《并网发电厂辅助服务管理暂行办法》中，黑启动是指电力系统大面积停电后，在无外界电源支持情况下，由具备（）的发电机组所提供的恢复系统供电的服务。

A.自启动能力

B.自保能力

C.备用电源

D.柴油机组