题目内容

下列字符型常量的表示中，错误的是（）。

A. "l2+13"
B. "[x=y]"
C. ．[[北京]]
D. ["等级考试"]

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Anv student who__________ his homework is unlikely to pass the examination.

A. reduces
B. offends
C. praetices
D. neglects

They took__________measures to prevent poisonous gases from escapin9．．

A. beneficial
B. effective
C. fruitful
D. valid

He changed so__________that we hardly recognized him．

A. occasional
B. accidental
C. enormous
D. immediately

从研究方法看，以“传统—现代”为核心概念的社会发展理论是一种（）。

A. 结构论研究
B. 历史论研究
C. 共时态研究
D. 历时态研究