Although scientific progress leads to constant revision of ideas, one observation that has remained strong over the years is that there are a lot of insects in the world: some 950,000 species have been identified.
雖然科學進步會產生想法上不斷的改變，但是一個已經維持很久的觀點那就是世界上有很多昆蟲：大概有九十五萬種被認別出來了
來源：GRE考古題
原題：
Although scientific progress leads to constant revision of ideas, one observation that has remained _____ over the years is that there are a lot of insects in the world: some 950,000 species have been identified.
Arobust
Bsignificant
Cstrong
Dperplexing
Econfounding
Fobscure
邏輯詞是Although，代表前後兩個小句子取反，再來『：』，冒號表示說明補充或解釋，所以他的出現代表著她跟上一個小句子邏輯相同，邏輯詞找好了就來找關鍵字
Although scientific progress leads to constant revision of ideas，不斷修改，所以後面應該表達完全不想修改的意思才能展現Although的作用，那後面就直接找和remained 湊起來還是表示不想更改的意思即可，所以就選"強硬"，(A)，(C)
單字：
robust，(adj)強硬的
significant，(adj) 重要的
strong，(adj) 強壯的
perplexing，(adj) 令人困惑的
confounding，(adj) 令人困擾的
obscure，(adj)模糊的
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