579.The woman pulled her hat low down ______ her eyes in order not to be recognized by the angry crowds.
A.under
B.below
C.on
D.over
580.Do come here tomorrow ______ we,as planned,will enjoy the wonderful performance together.
A.otherwise
B.or
C.and
D.therefore
579.答案是D;考查介词词义辨析。句意:她把帽子拉下遮住了眼睛，以免被愤怒的人们辨认出来。
580.答案是C;祈使句+and+简单句。
