34. Which of the following is best supported by th...

Câu hỏi: 34. Which of the following is best supported by the passage?

A A. To effectively control pollution local government should regularly review their air pollution laws.

B B. One of the most important steps in preserving natural lands is to better enforce air pollution laws.

C C. Scientists should be consulted in order to establish uniform limits for all air pollutants.

D D. Human activities have been effective in reducing air pollution.