（09青岛）有一包固体粉末，可能含有碳酸钠、硫酸钠、硝酸钡、氯化钾和氯化铜中的一种或几种。未确定其组成，进行如下实验：

（1）取该固体粉末少量，加足量水，搅拌，静置，得到白色沉淀，上层为无色溶液；

（2）过滤，在白色沉淀中加入足量稀硝酸，白色沉淀有一部分溶解，且有无色气体产生。依据上述实验对原固体粉末的判断正确的是

A．一定含有碳酸钠、硫酸钠、硝酸钡、氯化钾，可能含有氯化铜

B．一定含有碳酸钠、硫酸钠、硝酸钡，一定不含氯化铜，可能含有氯化钾

C．一定含有碳酸钠、硫酸钠、硝酸钡，可能含有氯化铜；氯化钾

D．一定含有碳酸钠、硝酸钡，一定不含硫酸钠、氯化铜，可能含有氯化钾

Why do I want to go to college No one has ever asked me (41) a question. But many times I have asked myself. I have (42) a whole variety of reasons. (43) important reason is that I want to be a better man.Many things make human beings different (44) or better than or even superior to animals.One of the most important things is (45) . If I fail to receive higher education, my education (46) . As I want to be a fully (47) man, I must get a well-rounded education, which good colleges and universities are supposed to (48) . I know one can get educated in many ways, but colleges and universities are (49) the best places to teach me how to educate myself. Only when I am well-educated, will I be a better human being and (50) fit into society.

第（2）空应选择（）

A. come up with 

B. agreed with 

C. been fed up with 

D. got on well with