题干
While _____ to foreigners, you must try to make yourself _____ by using body language if necessary．
A：speaking? understand
B：spoken; understand
C：speaking; understood
D：spoken; understood
答案(点此获取答案解析）
C
③求三个数a,b,c中的最大数.④求函数
的函数值. 不需要用条件语句来描述其算法的有 ( )