Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.
A．breakthrough; whatB．breakdown; which
C．breakup; that D．breakthrough; which
D

試題分析：考查名詞和非限制性定語從句：句意：科學(xué)家在癌癥療法上已經(jīng)有了重大發(fā)現(xiàn)，這對于癌癥患者是好消息。第一空填A(yù). 或D“breakthrough”突破，B. breakdown;破裂，C. breakup分手，第二空是非限制性定語從句，用which指代前面的句子，選D。
點(diǎn)評：詞義辨析題在高考中有所涉及，每年的趨勢不盡相同。對于詞義辨析題目，首先可以從句意著手，看懂句意是解答此類題目的關(guān)鍵，其次四個(gè)選項(xiàng)的意思也要了如指掌。在非限定性定語從句中，關(guān)系詞不能用that。
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