16. A large (collections) of materials (focused) on Louisiana’s (history )and culture is (provided) by the Williams Reseach Center in New Orleans.
collections很明显错了,但focused为什么不用focusing呢?
那位能解答一下啊
14.Today _____ little fossil ivory remains comes from Alaska.
(A) what
(B) which
(C) there is
(D) where
答案是A,但感觉老有点模糊。little fossil ivory remains comes from Alaska,去掉,What,直接这样说可以吗?
18. Because the diamond is the hardest (naturally) substance, it is used in industry for (to cut), grinding, and boring other hard materials.
答案很明显是to cut,但naturally有问题吗?
是人focus A large collections of materials on Louisiana’s history and culture ,这里用的是被动,相当于 materials which are focused on Louisiana’s history and culture 。