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【判断题】
最先是在研究胃癌时发现肿瘤干细胞，随后在一些实体瘤研究中也陆续证实肿瘤干细胞的存在。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】听力原文：(A) He's making a presentation. (B) He's handing out presents. (C) He's putting on his jacket. (D) He's training his horses.
A.
B.
C.
【简答题】听力原文：(A) He's reading a sign. (B) He's putting a sign on the wall. (C) He's signing a document. (D) He's using a typewriter.
【单选题】听力原文：(A) He's using a knife and fork. (B) He's operating heavy equipment. (C) He's shredding paper. (D) He's driving to work.
A.
B.
C.
【单选题】听力原文：(A) He's opening the window. (B) He's removing the lid. (C) He's closing the trunk. (D) He's riding in the back seat.
A.
B.
C.
【单选题】听力原文：(A) He's reaching for the roof. (B) He's holding a long pole, (C) He's playing golf. (D) He's making a painting.
A.
B.
C.
D.
【单选题】听力原文：(A) He's pouring a cup of coffee. (B) He's emptying his pockets. (C) He's spilling the liquid. (D) He's brewing a pot of coffee.
A.
B.
C.
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