真菌感染( )
A．痰白黏稠且牵拉成丝B．粉红色泡沫痰C．黄绿色或翠绿色痰D．铁锈色痰E．恶臭痰
参考答案：A
______ is reported that many young people go to big cities to earn money.
A．This
B．That
C．It
D．As
什么是孔隙度？岩石的孔隙度有几种？
