E花环分离法是用于分离（）
A.单核细胞和淋巴细胞
B.T细胞和B细胞
C.单个核细胞
D.红细胞
E.白细胞
参考答案：B
During the Shanghai World Expo, he took many photos, ________ many soon have been downloaded
by lots of Internet users. [ ]
A. of them
B. of which
C. from which
D. among them
加热温度高，生成氧化铁皮多有什么危害？
