1 t 请教语法问题 谢谢

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1 t 请教语法问题 谢谢

1.The （initial discovery ）by humans almost 10,000 years ago that they could exploit metallic（ mineral ）deposits was an（ important） milestone in the （development civilization）..
我知道d 不对 名词和名次中间加of ，可是为什么不能看作 名词修饰名词呢？

2.The seventeenth-century discovery ___of life that are invisible to the naked eye was a dramatic one in human history.
(A)of forms
(B) that forms
(C) forms
(D)forms are
答案 c? 选a 为什么不可以呢？ 像上道题一样 名词间加of