【B3】
A. walked
B. was walking
C. left
【B2】
A. paid
B. made
C. watched
According to the passage, Texas probably is ______.
A. in the south of America
B. on the south of America
C. to the north of America
D. to the south of America
2、3、4顺序入栈(起始为空栈),只要栈不空即可出栈,不可能的序列是()。
A. 4、3、2、1
B. 2、1、3、4
C. 1、2、3、4
D. 4,3,1,2