题目内容

Primitive men, due to lack of such entertainments as modern men have, easily got bored.()

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Television gets much of its financial source from advertising and is by nature more Republican than the newspapers.()

Psychology, philosophy, and anthropology are all concerned with the study of meaning.()

下列氨基酸中是碱性氨基酸的是

A. 丙氨酸
B. 天冬氨酸
C. 赖氨酸
D. 缬氨酸
E. 脯氨酸

在下列元素中，那项被用作原子量测量的新的国际标准()。

A. 1H
B. 19F
C. 40Ca
D. 16O
E. 12C