It is the third time ________ I have been here. [ ]
A. which
B. who
C. that
C
胶体物质在水中分布比较均匀。
下列是体循环淤血症状，除了（）
A.纳差、恶心
B.上腹胀痛
C.少尿
D.水肿
E.呼吸困难
