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【单选题】
1953年,哪两位科学家用X射线衍射法发现了DNA的双螺旋结构,从分子水平上揭示了DNA结构和功能的关系,奠定了分子生物学的基础:A.
J.D.Watson和H.C.Crick。
B.
Waldeyer和Van Beneden。
C.
M. J. Schleiden和 T. Schwan。
D.
R. Virchow和Van Beneden。
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举一反三
【单选题】After reading the passage, what can we infer about Shakespeare?
A.
He received a good education in a local school.
B.
He was poor and without friends throughout his life.
C.
He made a wise decision in leaving his hometown.
D.
He was happily married to Anne Hathaway.
【简答题】下列哪个是肿瘤相关抗原?
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