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【单选题】
关于exists子查询，以下说法中错误的是（ ）A.
使用Exists关键字引入子查询后，子查询的作用就相当存在测试。
B.
子查询实际上不产生任何数据，它只返回true或false。
C.
由Exists引入的子查询的字段列表要列出列名。
D.
不存在使用not exists关键字
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【简答题】free of charge
【单选题】The definition of( ) is a law which is enacted by the legislative branch of a government such as Congress or a state legislature and generally signed into law by the president or a governor.
A.
regulation
B.
statute
C.
ordinance
D.
order
【单选题】According to the definition,Health is described _____ "a state of complete physical, mental, and social well-being".
A.
on
B.
as
C.
for
D.
of
【简答题】be free of charge
【单选题】By mentioning the definition of waste, the author intends to_____.
A.
clear the misunderstanding of its meaning and its coverage
B.
state that people tends to 'like the new and hate the old'
C.
manifest the fact people don't record things about rubbish by sarcasm
D.
prove that ignorance can lead to terror and inaction
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