不同的职业危害对人体的危害不同，如（）可导致尘肺病。
A、粉尘
B、毒物
C、噪声
参考答案：A
如图所示，三个电学实验中，图 _________ 装置能够说明电磁感应现象的规律，图 _________ 电源装置能够说明磁场对电流作用的规律．
The recent conference on the effective use of the seas and oceans was another attempt resolving major differences among countries with conflicting interests.()
A. resolve
B. resolves
C. to resolve
D. being resolved
