题目

I don’t know ______ or not the books _____ to the homeless children next month are really useful.   A. if, given             B. whether, to be given     C. whether, giving      D. if, which are given 答案：B（2015秋•保定期末）点C是线段AB的黄金分割点，且AB=6cm，则BC的长为（ ）A．（3﹣3）cm B．（9﹣3）cmC．（3﹣3）cm 或（9﹣3）cm D．（9﹣3）cm 或（6﹣6）cm