按照能源的形成和来源，可分为( )大类。
A．二
B．三
C．四
D．五
参考答案：C
People choose names like Alex and Serene because these names are _________. [ ]
A. well-known
B. well know
C. known well
D. know well
不属于输血传播疾病的是()
A．丙型肝炎
B．巨细胞病毒感染
C．乙型肝炎
D．疟疾
E．甲型肝炎
