What is correct about the spot 20 miles northwest of the plant A. There is more radiation here than other places from 12 to 37 miles away from the disabled power plant. B. The radiation levels here will pose an immediate health risk to the residents. C. The radiation levels here will be a health hazard in the long run. D. The radiation here comes from rock outcroppings, cosmic rays and other natural sources.
【参考答案】
[解析] 6-7 The first radiation levels from the vicinity o......