新生儿溶血病换血疗法的换血量为（），导管插入部位为（）。

初二学生小峰在学校与别人关系不错，但回到家里却与父母“话不投机半句多”，对父母的言行看不惯，对父母的管教听不进，这种现象

①是青春期“逆反心理”的表现，是一种正常现象，不必计较

②发展下去，会影响家庭和谐

③主要是父母思想落伍、不理解子女的心理造成的

④不利于小峰身心健康发展

A．①②③

B．②③④

C．①②④

D．②④

水的相对分子质量为18，则1个水分子的质量为(　　)

A．

B．g·mol^-1

C．18n_a g

D．g

对一群在1950年35岁的人的长期健康跟踪研究表明，从整体上讲，那些过了35岁以后平均每年体重增加半公斤或一磅的人倾向于比那些过了35岁以后体重保持不变的人活得长。这个结果好像与其他研究相矛盾，其他研究把体重增加与一大堆的健康问题联系起来，并且体重增加倾向于使一个人的平均寿命降低。

下面哪一项，如果正确，最有助于解决上面短文中明显相互冲突的结果？（）

A．随着人们年龄的增加，肌肉和骨骼组织占人体总重的比例倾向于越来越小

B．那些通过减轻体重来降低胆固醇含量的人同时也降低了他们遭受心脏病或中风袭击的危险性

C．抽烟者倾向于比不抽烟者瘦，活的时间也倾向于比不抽烟者短

D．人类免疫系统随着年龄增加的正常退化可以通过减少热量的消耗来抑制

根据《中华人民共和国宪法》和《中华人民共和国民族区域自治法》,我国1955年10月1 日成立了新疆维吾尔自治区。回答1-2题。

1．新疆55年的发展，也是我国民族区域自治制度的光辉实践。下列关于民族区域自治的表述，正确的有 [ ]

 ①民族区域自治是指在各民族聚居地方实行区域自治，设立自治机关，行使自治权 ②民族乡是最基层的民族自治地方 ③自治机关是指民族自治地方的人民代表大会和人民政府 ④民族区域自治是我国的基本民族政策

A．①②

B．①③

C．②③

D．③④

2．新疆自治区成立以来，中央政府为推动新疆经济的快速发展，实施了“收入全留、补助递增、专项扶持”的财政政策，执行比全国低3个百分点的税收优惠政策。这体现[ ]

A．我国解决了各民族发展不平衡问题

B．我国实行各民族共同繁荣的原则

C．国家扶持是新疆地区发展的决定性因素

D．民族区域自治是我国解决民族问题的基本原则

Children start out as natural scientists, eager to look into the world around them. Helping them enjoy science can be easy; there’s no need for a lot of scientific terms or expensive lab equipment. You only have to share your children’s curiosity. Firstly, listen to their questions. I once visited a classroom of seven-year-olds to talk about science as a job. The children asked me "textbook questions" about schooling, salary and whether I liked my job. When I finished answering, we sat facing one another in silence. Finally I said, "Now that we’re finished with your lists, do you have questions of your own about science"

In the last sentence of the first paragraph, the word "lists" could best be replaced by ______.
A. any questions B. any problems
C. questions from textbooks D. any number of questions

After a long pause, a boy raised his hand, "Have you ever seen a grasshopper eat When I try eating leaves like that, I get a stomachache. Why"
This began a set of questions that lasted nearly two hours.
Secondly, give them time to think. Studies over the past 30 years have shown that, after asking a question, adults typically wait only one second or less for an answer, no time for a child to think. When adults increase their "wait time" to three seconds or more, children give more logical, complete and creative answers.
Thirdly, watch your language. Once you have a child involved in a science discussion, don’t jump in with "That’s right" or "Very good". These words work well when it comes to encouraging good behavior. But in talking about science, quick praise can signal that discussion is over. Instead, keep things going by saying "That’s interesting" or "I’d never thought of it that way before", or coming up with more questions or ideas.
Never push a child to "Think". It doesn’t make sense, children are always thinking, without your telling them to. What’s more, this can turn a conversation into a performance. The child will try to find the answer you want, in as few words as possible, so that he will be a smaller target for your disagreement.
Lastly, show; don’t just tell. Real-life impressions of nature are far more impressive than any lesson children can learn from a book or a television program. Let children look at their fingertips through a magnifying glass, and they’ll understand why you want them to wash before dinner. Rather than saying that water evaporates, set a pot of water to boil and let them watch the water level drop.