恳请帮忙解答prep1一道题

22.   1599-!-item-!-187;#058&000810

Of the 800 sweaters at a certain store, 150 are red. How many of the red sweaters at the store are made of pure wool?

(1)  320 of the sweaters at the store are neither red nor made of pure wool.

(2)  100 of the red sweaters at the store are not made of pure wool.

答案选B   我选的E  题目中没有说除去不是wool的 就一定是wool 的阿 难道不用考虑有别的材质的么？

谢谢各位拉~

了了