我国领土南北跨纬度近_____度，大部分位于_______带，南部少数地区位于_____带，没有_____带。
50；北温；热；寒
_____ she had not spelt the word wrong, Cathy would have got a full mark. [ ]
A. If
B. Since
C. Though
D. When
成人白细胞计数参考值是( )
A．(4～10)×1012/LB．(2～5)×109/LC．(4～10)×109/LD．(10～20)×1012/LE．(20～40)×1012/L
