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【单选题】
判断 char 型变量 c1 是否小写字母的正确表达式为 ( )A.
'a'<=c1<='z'
B.
(c1>='a')&&(c1<='z')
C.
(c1>=a)&&(c1<=z)
D.
('a'<=c1)||('z'>=c1)
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A.
differ greatly from movements in GNP.
B.
do not differ greatly from movements in GNP.
C.
are not allowed to differ at all from movements in GNP by definition.
D.
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E.
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A.
and GNP usually do not differ greatly.
B.
and GNP usually do not differ greatly, as a practical matter.
C.
and GNP usually do differ greatly.
D.
are usually smaller than those of GNP movements, in practice.
E.
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