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【单选题】
下列六个关系式: 1 {a,b}⊆{b,a} 2 {a,b}={b,a} 3 {0}=¢ 4 0∈{0} 5 ¢∈{0} 6 ¢⊆{0},其中正确的个数为 ( )A.
6个
B.
5个
C.
4个
D.
少于4个
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A.
in order that
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because
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so as to
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in order that
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A.
_________be healthy, teenagers need to get enough sleep. [ ] A. So that
B.
In order that
C.
In order to
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A.
will
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shall
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may
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would
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