肾小管性蛋白尿时尿中何种蛋白升高（）。
A.白蛋白
B.IgM
C.β2+-微球蛋白
D.IgG
E.脂蛋白
参考答案：C
Seven people in all lost their lives in the accident, three of _____ Chinese.
A．which
B．whom
C．them
D．who
The book _____ was written by Yu Dan sells well. [ ]
A. who
B. which
C. how
D. what
