可产生γ-氨基丁酸（）
A．丝氨酸
B．精氨酸
C．苯丙氨酸
D．半胱氨酸
E．谷氨酸
参考答案：E
________ you to be the first to solve the structure of DNA?
A．What you think led
B．What do you think led
C．Do you think what led
D．What led you think
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