城市居民之间的社会互动及由此形成的社会关系的性质和范围，指的是（）。
A. 城市社会关系空间
B. 城市居民心理空间
C. 城市居民互动空间
D. 城市社会网络空间
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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"]
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
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