化学用语是学习化学的重要工具。以下化学用语或表述正确的是() A.乙烯的结构简式

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问题:

化学用语是学习化学的重要工具。以下化学用语或表述正确的是(   )

A.乙烯的结构简式:CH2CH2

B.碳正离子中质子数与电子数之比值为3:2

C.钙离子的基态电子排布比:1s22s22p63s23p6

D.NaHCO3水解反应的离子方程式:HCO3-+H2OH3O++CO32-

考点:质量守恒定律
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下列叙述中,属于生物因素对生物影响的是(  )

A.“春来江水绿如蓝”

B.“雨露滋润禾苗壮”

C.“草盛豆苗稀”

D.“竹外桃花三两枝,春江水暖鸭先知”

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当前社会专业技术人员诚信缺失表现在哪几个方面。()

A.学历造假

B.工作业绩或数据造假

C.资金使用造假

D.产品成分不实或功效虚夸

题型:选择题

细石器是指用间接打击法剥落的()加工的石器。

题型:选择题

阅读理解。

       1   Because, from what I could see, it seemed that grown-ups often forgot. I never wanted to

forget - I wanted to be able to remind other adults and myself when the time came. I began consciously

thinking this at quite an early age.

     As soon as I was fully aware of myself, I regarded me as a little person and liked adults who thought

of and treated me the same way. I didn't have a doll and I didn't want one. I wanted animal toys, even a

single animal. Why wouldn't my parents give me the one thing I wanted?   2   

      Instead, my dad somehow managed to buy me a full set of encyclopedia (百科全书) and books with maps and color pictures long before I could read. Well, guess what? I learned to read without realizing it! Later, I found out when I started school and it all came so easy especially geography.   3   Because of all

the books my father bought me, I knew a lot of words that other children didn't know at my age.

     I love words. They opened up new worlds for me.   4   Parents, please make sure your kids have a

computer. Let them explore-as safely as possible-let them do their own things and discover the world.

     Now, most kids lead a happy life. They can get what they want from their parents. But children should

learn to be independent.   5   Be independent to do your own things.

A. Because of them, I read and thought, and today, I write.

B. When I was a child, I promised myself to try to remember as much as I could.

C. I listened and heard everything, even if I didn't understand everything.

D. I nearly knew every place on the map like the teacher.

E. But more than anything, it made me feel uncomfortable and I knew it wasn't nice.

F. Later, I knew we didn't have much money, but how expensive could a toy be?

G. Be independent to learn some useful knowledge.

题型:选择题

下列字符中,其ASCII码值最大的是

A.5

B.b

C.f

D.A

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