题目

AIDS is said____the number one killer of both men and women over the past few years in that poor area, where no medical services are available.        A．to be B．to have been     C．being D．having been 答案：B沿海核电站污染近岸水域，因为它向海洋排放 [　　] A．重金属B．热水 C．粉尘D．废气