依我国《商标法》规定，下列哪项可以作为商标提出注册申请______
A．海浪的声音 B．玫瑰花的气味C．鸟鸣的声音 D．风景图片
参考答案：D
用所给单词的适当形式填空
1. Trees must __________(prevent) from being cut down.
2. They __________(plant) ten thousand trees by last spring.
3. The sheep __________(tie) to the tree has eaten a lot of grass.
4. I can easily hear combs __________(go) through hair.
5. Great changes __________(take) in our hometown in the last ten years.
由单独的直流电源供电，这种发电机叫（）直流发电机。
A.串激
B.差复激
C.他激
