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たびたびの質問で失礼いたします。
下記の２問をよろしくお願いします。
【１】
The geologic record indicates that a desert expands and conracts in response to alternating dry and wet climatic periods, <<whether there is any human intervention>>.
(A) whether there is any human intervention
(B) with or without human intervention
(C) when there is human intervention and when there is none
(D) human intervention or not
(E) no matter whether humans intervene
正解は（B）です。
（E）を選んで間違えたのですが、no matter whether という表現はしないのでしょうか？ また、（A)にはor not が必要なのでしょうか？
【２】
Although Navajo silversmiths borrowed designs from both Mexican and Plains Indian sources, they adapted the disigns into forms that were <<distinctively their own>>.
(A) distinctively their own
(B) distinctive to themselves
(C) distinct as theirs
(D) their own, distinctively
(E) distinct and their own
正解は（A）です。
なんとなく（A）がよいような気はするのですが、どこがどうよいのか（あるいは他がどうよくないのか）分りません。
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