多目标分析方法的英文缩写是（）。
A．CBA
B．RBA
C．MCA
D．CEA
参考答案：C
常用的避孕方法有：_________、_________、_________、_________。
-Mr. Green, __________ you __________ the Great Wall last Sunday?
-No, but I'll visit it next week.[ ]
A. will; go to
B. have; been to
C. did; go to
D. have; gone to
