单项选择题

我国哪位科学家首先在世界上第一个用人工方法合成结晶牛胰岛素？

A．钱永健
B．朱棣文
C．丁肇中
D．钮经义

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单项选择题

关于集合的特性，下面那个描述是错误的：

A.集合内部的元素存在唯一性。
B.集合内部的元素不按顺序排列。
C.集合无法按照下标进行访问。
D.Set初始化赋值后，元素值允许变更。

单项选择题

Which of the following is correct about AD?

A． Aβ is produced by sequential cleavage of the amyloid precursor protein (APP)
B． Inhibiting mTOR signalling with rapamycin reduced Aβ and Tau protein pathology and significantly rescued cognitive impairmen
C． Heterozygous deletion of autophagy initiating Beclin 1 increases intracellular and extracellular Aβ depositions
D． All of the above