“绿色化学”的特点之一是“零排放”．一定条件下，二氧化碳和氢气可以按照不同比例反

It was a 小题1:  Saturday afternoon in Oklahoma City. My friend ，a proud father Bobby Lewis was taking his two little boys to a park. He walked  小题2: to the assistant at the ticket counter and said, "How much is it to get in?"

The young man replied, "$3.00 for you and $3.00 for  小题3:   kid who is  小题4:  than six. We let them  小题5:  free if they are six or younger. How old are they?"

Bobby replied, "Joe's three and David’s seven, so I guess I owe you $6.00."

The man at the ticket counter said, "Hey, Mister, did you just win the lottery or something? You could  小题6: yourself three dollars. You could  小题7:  told me that the older one was six; I wouldn't know the difference." Bobby replied, "Yes, that may be   小题8:  , but the kids would know the difference."

In challenging times when ethics (道德规范)are more important than    小题9:  before, make sure you set a good 小题10:  for everyone you work and live with.

将数字1，2，3，4填入标号为1，2，3，4的四个方格里，每格填一个数字，则每个方格的标号与所填的数字均不相同的填法有（　　）

A．6种

B．9种

C．11种

D．23种

在16PF测验中，保守以及尊重传统观念与道德准则是（）因素的低分特征。

A.乐群性

B.稳定性

C.敢为性

D.实验性

下图为两种单基因遗传病的系谱图，已知个体6不带有甲病的致病基因。（甲病基因用B、b，乙病基因用A、a）

乙病是位于（）染色体上的（）性基因控制的遗传病。做出此判断的理由是（）

简述电弧的产生和几种灭弧的方法。