丙肝的主要传播途径是（）。
A.体液传播
B.接触传播
C.粪-口途径
D.呼吸道传播
E.血液传播
参考答案：E
Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
A．why
B．that
C．when
D．ours
