Though she has been in England for half a year, she is still unable to _____ in simple English.[ ]

A. explain herself    

B. express herself  

C. speak her mind    

D. make herself understand

可引起农民肺的粉尘是

A．棉、麻等植物性粉尘
B．田间飞扬的粉尘
C．谷物类粉尘
D．霉变枯草粉尘
E．飞扬的人、畜粪粉尘