The black pants are ______ ¥27. [ ]
A. too
B. very
C. also
D. very much
答案:C
下列属于学习行为的是( )
A.蜜蜂酿蜜
B.蚕取食桑叶
C.牛耕田马拉车
D.孔雀开屏
站内无空闲线路的特殊情况下,只准接入哪些列车?