关于红细胞和血红蛋白生成不足所致的贫血,以下哪项不正确
A.营养性巨幼红细胞贫血
B.营养性缺铁性贫血
C.再生障碍性贫血
D.感染性贫血
E.珠蛋白生成障碍性贫血
参考答案:E
在太阳、月亮、点燃的蜡烛、发光的白炽灯中,不是光源的是_____________。
“On no account _____ to feed the animals,” the warning can be seen on the signboard on front of every cage (笼子).
A.allow visitors
B.are visitors allowed
C.visitors are allowed
D.are allowed visitors