恶性组织细胞病的首发及常见症状是（）
A.出血
B.发热
C.肝大
D.贫血
E.感染
参考答案：B
This is my new car . I _______it for two weeks.
A．buy
B．bought
C．have bought
D．have had
深层地下水有何卫生学特征？
