下列哪种现象为血尿（）
A.乳白色尿液混有血液
B.淡黄色尿
C.深黄色尿
D.尿中有红细胞，外观淡棕红色
E.尿中无红细胞，外观浓茶或酱油色
参考答案：D
读一读，填空。
One duck has a mouth, two eyes and two legs.
Two ducks have two mouths, four eyes and four legs.
1. Three ducks have mouths, eyes and legs.
2. Four ducks have mouths, eyes and legs.
(one two three four five six seven eight)
甲盒中有3个不同的红球，乙盒中有5个不同的白球，某同学要在甲盒或乙盒中摸一球，则不同的方法有 [ ]
A．3种
B．5种
C．8种
D．15种
