【題目】Scientists have made a major ________ in the treatment of cancer.

A. barrier B. breakthrough

C. companion D. concern

【答案】B

【解析】

考查名詞詞義辨析。句意：科學(xué)家在癌癥治療方面取得了重大突破。A. barrier障礙物；B. breakthrough突破；C. companion同伴；D. concern關(guān)心。短語(yǔ)make a breakthrough突破。故選B。

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