Once upon a time，a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.
A．a(chǎn)nother　　　　　　　　B．sure
C．someD．certain
D

試題分析：考查固定用法。A certain="some" a某一個，某個（表示泛指，不確定的某一個）；句意：很久以前，一個著名的科學(xué)家說過對于我們每個人來說，生活都是不容易的，首先我們要信任我們自己。故D正確。
點(diǎn)評：本題考查了冠詞的固定搭配A certain="some" a某一個，某個（表示泛指，不確定的某一個）；冠詞用法中要特別注意：不定冠詞泛指某一個人或某一個事物。定冠詞特指某一人孩子某一個事物；解答有關(guān)冠詞的題型可以從三方面入手，一是習(xí)慣搭配，二是固定短語，三是具體語境分析。對于固定短語平時應(yīng)多讀多記。
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