下列选项哪个不是摄影的功能（）。
A.传播文明
B.影像工具
C.艺术创造
D.娱乐玩耍
参考答案：D
提高净化效率的途径有哪些？
---What shall we do with our project, stop or continue, sir?
---________ and try to finish it _______.
A．Go on to do it; ahead of time
B．Go on doing it; before time
C．Go ahead with it; ahead of time
D．Continue to do it; before the time.
