问题补充：
different life today is from it was thirty years ago.
A. What; what
B. What a ; what
C. What a; how
D. How; what
答案：
A. What; what
B. What a ; what
C. What a; how
(答案→)D. How; what
解析：本题易误选B。分析句子结构可知，life应为is的主语，different前应用how;from后为一个宾语从句，缺少引导从句的引导词，且从句中was后缺表语，故可排除C。
