1. Is the integer x divisible by 36? (1) x is divisible by 12. (2) x is divisible by 9
答案是E,为什么不是C?
2. Is rst = 1 ? (1) rs = 1 (2) st = 1 答案是E,为什么不是c?
3. In what year was Ellen born? (1) Ellen’s brother Pete, who is 1又1/2 years older than Ellen, was born in 1956. (2) In 1975 Ellen turned 18 years old. 答案是A,为什么条件2不可以?