—_____ does she visit her parents?
—Once a month.
A. How often
B. How long
C. How
答案:A
液压剪断器是液压驱动进行()作业的破拆救助器具。
—What happened to him? He promised to come by 9, but it’s now almost 8:50.
—Don’t worry. He is always _____.[ ]
A. punctual
B. reasonable
C. controversial
D. accurate