酸雨对生物有极大的危害,被称为“空中死神”…………………… …… ( )
√
酸雨会杀死水中生物,破坏水体生态平衡,而且伤害植物,破坏土壤肥力,被称为“空中死神”。
Crusoe found that nine savages seemed to be eating something which they ___ on the fire.
A.have cooked
B.had cooked
C.to have cooked
D.being cooked
再生障碍性贫血血象表现为()
A.全血细胞减少
B.红细胞及血小板正常
C.红细胞及血红蛋白均减少
D.血小板减少并有形态异常
E.周围血大量原始和幼稚白细胞