问题 选择题
下列物质中,能使酸性高锰酸钾溶液褪色的是(  )

A.甲烷

B.乙烯

C.苯

D.乙酸

答案

答案:B

读以下三幅图:

请回答:

(1)图1、2各反映了哪一大河流域的文明成就?两地人们当时各使用什么文字书写?

                                                                                                                                                             

(2)能代表图1所反映文明古国的另一典型文明建筑是什么?

                                                                                                                                                            

(3)图3所示数字的发明者和传播者各是谁?

                                                                                                                                                              

(4)基于以上你有何认识?

                                                                                                                                                              

单项选择题