主要死因为呼吸衰竭的急性中毒有（）
A.有机磷中毒
B.百草枯中毒
C.砷化氢中毒
D.阿片类药物中毒
E.氮氧化合物中毒
参考答案：A, B, D, E
—Are you _____ a very relaxing vacation this summer?
—Oh, yeah, of course. [ ]
A. planning to have
B. planning having
C. plan to have
D. plan having
实物资本
