问题 选择题

我国“神舟五号”载人飞船发射成功.它用物质M作为高能燃料,M燃烧的化学方程式为M+O2

 点燃 
.
 
N2+2H2O.则M的化学式是(  )

A.NH2

B.N2H2

C.N2H4

D.N2H6

答案

根据质量守恒定律和M+O2

 点燃 
.
 
N2+2H2O可知,每个M中含有2个氮原子和4个氢原子,是N2H4

故选C.

选择题
问答题

根据课文《陈涉世家》回答问题。

1.既然是写陈涉,为何开头并举吴广的籍贯、表字?

                                                                                                                                                             

2.第一段可以分几层,用"||"划出后,总结层意,并理出线索。

     层意:

(1)                                                                                                                                                      

(2)                                                                                                                                                      

(3)                                                                                                                                                     

     线索 :

                                                                                                                                                              

3.为什么在开头列出吴广呢?

____________________________________________________________________________

4.写陈涉作者有没有从他出生写起,详写了什么?

     作者专写了陈胜的              ,这是分清主次,突出重点。

     作者选择了                                         的典型事例,通过                     的细节,运用                     ,

                          以及                              的描写,揭示出陈涉年少时的个性。

5.这样写的目的是什么?主要反映在哪里?

     是为了介绍                        ,                       反映在                           中。                                表明其不甘贫穷,要改变现实的强烈愿望。                                            展现其远大理想。