劳动防护用品可按其防护性能、防护部位、用途进行分类。根据国家安全生产监督管理总局发布的《劳动防护用品监督管理规定》，按防护性能将劳动防护用品分为( )大类。

A．二

B．三

C．四

D．五

The United States ranks far behind countries such as Sweden and Canada when it comes to workplace safety. In all three countries, joint labor-management committees that oversee workplace safety conditions have been very successful in reducing occupational injuries. In the United States, such committees are found only in the few companies that have voluntarily established them. However, in Sweden and several Canadian provinces, joint safety committees are required by law and exist in all medium-sized and large workplaces.
Which one of the following is supported by the information above

A．The establishment of joint safety committees in all medium-sized and large workplaces in the United States would result in a reduction of occupational injuries.

B．A joint safety committee that is required by law is more effective at reducing occupational injuries than is a joint safety committee that is voluntarily established.

C．Workplace safety in Sweden and Canada was superior to that in the United States even prior to the passage of laws requiring joint safety committees in all mediumsized and large workplaces.

D．Joint safety committees had been voluntarily established in most medium-sized and large workplaces in Sweden and several Canadian provinces prior to the passage of laws requiring such committees.

E．(E) The United States would surpass Sweden and Canada in workplace safety of joint safety committees were required in all medium-sized and large workplaces in the United States.