引起弥散量增加的有（）
A.先天性心脏病
B.风湿性心脏病
C.红细胞增多症
D.贫血
E.肺出血
参考答案：C, E
— Oh, you are here. ?
— To the toilet.
A．Where have you gone
B．Where have you been
C．Where are you going
D．Where will you go
Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
A．having left
B．to leave
C．left
D．leaving
