根据所掌握的文化背景知识，选择最佳选项。 1. If you have a fe

下列说法中正确的是[ ]

A．在化学反应过程中，发生物质变化的同时不一定发生能量变化

B．生成物全部化学键形成时所释放的能量大于破坏反应物全部化学键所吸收的能量时，反应为吸热反应

C．反应产物的总焓大于反应物的总焓时，反应吸热，ΔH＞0

D．ΔH的大小与热化学方程式的计量系数无关

某工程师拟对两因子的问题进行2^2全因子试验设计。他拟合的模型为y=b0十b1x1+b2x2+b1x1x2后来有人提醒他需要增加几个中心点的试验，以检验模型是否存在曲性。于是他又补做了三次中心点的试验，然后重新拟合模型。我们可以推断，重新拟合的模型（）

A.参数估计b0、b1、b2、b12均不变

B.参数估计b0不变，但b1、b2、b12均可能有变化

C.参数估计b0可能有变化，但b1、b2、b12不变

D.以上答案都不对

下列对俗语、谚语和诗句所包含的哲理表述正确的是（）

①良言一句三冬暖、恶语伤人六月寒——坚持辩证的否定观

②无所不备，则无所不寡——集中力量解决主要矛盾

③不当家不知柴米贵，不养儿不知父母恩——实践是认识的来源

④水至清则无鱼，人至察则无徒——前途是光明的、道路是曲折的

A.①④

B.②④

C.①③

D.②③

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