Scientists are hoping for a _____ in the search for a cure for cancer.
A．breakthroughB．breakC．dealD．progress
A
考查名詞：A. breakthrough 突破B. break休息C. deal交易 D. progress 進步，句意：科學(xué)家希望在研究癌癥的療法上能有突破。選A。
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