将自来水加工成蒸馏水过程中，没有涉及到的过程或变化是
A．蒸发
B．冷凝
C．化学变化
D．物理变化
答案：C
自来水变成蒸馏水属于物理变化，所以答案选C。
I____________him to give up that stupid idea, but he just wouldn't listen. [ ]
A. persuaded
B. convinced
C. advice
D. tried to persuade
若已知char str[20];，且有语句cin＞＞str;，此时输入为“This is a program”，则所得的结果是str=( )。
A．This is a program B．ThisC．This is D．This is a
