受害方有选择合同效力的权利，对于可撤销合同是依据( )。A．实际履行原则 B．意思

I will never forget the year I was about twelve years old. My mother told us that we would not be (16) Christmas gifts because there was not enough money. I felt sad and thought, "What would I say when the other kids asked what I’ d (17) " Just when I started to (18) that there would not be a Christmas that year, three women (19) at our house with gifts for all of us. For me they brought a doll. I felt such a sense of (20) that I would no longer have to be embarrassed when I returned to school. I wasn’t (21) . Somebody had thought (22) of me to bring me a gift.

Years later, when I stood in the kitchen of my new house, thinking how I wanted to make my (23) Christmas there special and memorable, I (24) remembered the women’s visit. I decided that I wanted to create that same feeling of (25) for as many children as I could possibly reach.

So I (26) a plan and gathered forty people from my company to help. We gathered about 125 orphans (孤儿) at the Christmas party. For every child, we wrapped colorful packages filled with

toys, clothes, and school supplies, (27) with a child’ s name. We wanted all of them to know they were (28) Before I called out their names and handed them their gifts, I (29) them that they couldn’t open their presents (30) every child had come forward. Finally the (31) they had been waiting for came as I called out, "One, two, three. Open your presents!" As the children opened their packages, their faces beamed and their bright smiles (32) up the room. The (33) in the room was obvious, and (34) wasn’ t just about toys. It was a feeling, and the feeling I knew (35) that Christmas so long ago when the women came to visit. I wasn’t forgotten. Somebody thought of me. I matter.

25().

A. strength

B. independence

C. importance

D. safety

在托盘天平两端各放一只等质量的烧杯，向两只烧杯中分别注入相同质量、相同质量分数的稀硫酸，天平平衡。向左盘烧杯中加入镁，右盘烧杯中加入铁，反应完毕后，天平仍然平衡，则加入镁和铁的质量比可能是[ ]

A.1∶1

B.3∶7

C.7∶3

D.81∶77

下列说法错误的是（　　）

A．化学反应必然伴随能量变化

B．能量变化是化学反应的特征之一

C．化学变化中的能量变化是由化学键的变化引起的

D．化学反应中能量变化的大小与反应物的多少无关

木岔枕长度共分为（）等级，其中最短为（）最长为（）级差为（）。

2013年7月19日，西藏各族人民群众热烈庆祝西藏和平解放60周年。近年来，中央加大了对西藏的投资力度。2013年，国家对西藏投资达到360亿元，创历史新高。国家之所以加大对西藏的投资力度，是因为（）。

①各民族共同繁荣是民族平等和民族团结的物质保证

②民族平等和民族团结是实现各民族共同繁荣的前提条件

③加大对民族地区的扶持是推动民族地区发展的主要途径

④国家实现现代化需要各民族经济文化的共同繁荣

A.①②

B.③④

C.①③

D.①④