干冰可用于人工降雨，干冰的化学式为______．医疗上常用体积分数为70%～75

( )是建设工程项目的质量内涵。

A．建筑产品本身客观上已存在的某些要求

B．法律法规和合同所规定的技术要求

C．满足明确和隐含需要的特性之总和

D．满足质量要求的一系列相关活动

阅读理解。

     Combining families with kids can be tough and offers even more unexpected problems. You just don't

know how things will shake out until everyone is under one roof, trying on new roles with name that start

with "step". This is what happened to Sheila and Will, and Sheila's 8-year-old daughter Ashley. After the

couple got married, and Will became the member of the new family, things got worse than expected. How did they make it work? Read the full version of the story here.

      Shelia's Turn: When Shelia and Will were dating, he seemed like kids, especially Ashley. He'd bring

her presents, play games with her. But after the wedding, things took a turn. Will suddenly became a

super strict stepfather, scolding Ashley for watching too much cartoons, constantly picking fights and

punishing her for offenses as small as spilling milk. Shelia's thought about leaving Will, but soon after they

married, they had a son, Billy. Will adores his well-behaved boy, but Ashley hates him. Shelia doesn't

know what to do--- her daughter is miserable, but leaving her husband might mean losing her son.

      Will's turn: Will was so excited to be a male role model in Ashley's life. He didn't just want to be a

guy living in her house; he wanted to treat her like his own daughter, which, to Will, meant giving Ashley

more rules and help her learn responsibility. He'd always felt that Shelia let Ashley loose on everything.

But after the wedding, Will was surprised that Shelia didn't want him to do that. If Will takes away Ashley's TV privileges or tells her to clean up her room, Shelia just lets Ashley do what she likes and does it

herself. Will was tired of this and he'd rather take his son and go.

      The advisor's turn: The counselor(顾问) quickly recognized their conflict as a classic case of

unspoken, hidden expectations. Before the wedding, when it was just Shelia and Will, everything was

easy. But now, everyone in their big family is competing for attention, and the couple never sat down and

discussed the biggest issue-their child-upbringing philosophies(育儿经). The counselor suggested Shelia

allow Will to give some rules on Ashley but Will's punishments couldn't be extreme. Once Ashley saw

that her mom and stepdad had become a united front, she cooperated more.

1. The text is most likely to be found in a book about______.

A. popular science            

B. historical events

C. social problems            

D. political systems

2. The reasons for Ashley's dislike of Will are as follows except_____?

A. Will often picked fights with Ashley.

A. Ashley often spilled milk on the floor.

B. Will always punished her for bad behaviors.

C. Ashley was stopped watching too many cartoons.

3. What can we know about Will?

A. Will has a good intention.          

B. Will does not love children

C. Will does not love Shelia any more    

D. Will's way of parenting is very perfect.

4. It can be inferred from the passage that the advisor's attitude to their problem?

A. Negative    

B. Objective    

C. Critical    

D. Subjective

这个标志是何含义？（）

A．注意保持车距

B．车距确认路段

C．车速测试路段

D．两侧变窄路段

审计人员正在检查计算机打印的存货清单，以确定存货的总价是否明显高估。由于没有时间划精力对仓库中所有的存货加以检查，必须进行存货抽样。如果样本规模是固定的，则在此情形下，以下哪种抽样法最准确？（）

A.选择最容易检查的项目

B.采用简单的随机取样法

C.能使给定存货被抽中概率与其销售量成比例的取样法

D.能使给定存货被抽中的概率与其账面值成比例的取样法

简述文化的一般特征。