It's ten years since the scientist _______on his life's work of discovering the valuable chemical.
A．made forB．set outC．took offD．turned up
B
此題考短語(yǔ)動(dòng)詞。句子合理的意思應(yīng)是：自從那位科學(xué)家著手／開(kāi)始去為發(fā)現(xiàn)這一有價(jià)值的化學(xué)物質(zhì)而工作。至今已經(jīng)10年。選B項(xiàng)表開(kāi)始或著手某事，即set out to do sth.或set out on sth.正合理。make for不是固定短語(yǔ)，只能解釋為“為……而做”，take off當(dāng)“脫下（衣物）、從……取下……、（飛機(jī)）起飛”等解，turn up意為“出席、露面”，這三項(xiàng)均不合題意。
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