白细胞正常或减少的传染病有（）。
A.伤寒
B.霍乱
C.病毒性肝炎
D.疟疾
E.乙脑
参考答案：A, C, D
The watch was very good, and he _______ 20 percent down for it.
A．paid
B．cost
C．bought
D．spent
