语法问题

alvinzhangUID: 198862

1. First designated in 1970, Earth Day has become an annual international event ______ concerns about environmental issues such as pollution.
(A) dedicated to raising
(B) dedicated raising
(C) dedicates to raise
(D) that dedicates to raising
答案：A
dedicate的用法是怎样的？　Ｄ为何错？

2. ____ that distinguish human beings from mother primates are related to the ability of people to stand upright and walk on two legs.
(A) Many of the physical characteristics
(B) Of the many physical characteristics
(C) The physical characteristics
(D) There are many physical characteristics
答案：A
C为何错？

Because the diamond is the hardest naturally substance, it is used in industry for to cut, grinding, and boring other hard materials.
C一定是错的，可B对马？可以说naturally substance??

alvinzhangUID: 198862

牛人请进，谢谢帮忙！

StephenineUID: 2167283

be dedicated to doing
第二题C选项少了 后面有are many

parallel_babyUID: 2172384

be dedicated to,to 是介词
第二题如果选C，句意太绝对了，不是所有physical characteristic都………
第三题我也在困惑

alvinzhangUID: 198862

谢谢

lq21233UID: 2166224

dedicate
VT.所以要be dedicated to
第三题是白送分的吧
两个都错了啊