【题目】Some scientists believe that there is no _______ that the new medicine for cancer will be found. ( )
A. problem B. matter C. doubt D. question
在线课程【答案】C
【解析】考查名词辨析。problem问题；matter事情；doubt疑问；question问题。句意：一些科学家相信——毫无疑问治疗癌症的新药将被发现。故选C。
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