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【单选题】
By citing the example of many couples, the author intends to show that ______.A.
good boundaries are small concerns rather than big deals
B.
it's silly for one to say hurtful things to his or her partner
C.
one should never be flirtatious with unfamiliar people
D.
there are things prohibited in a healthy relationship
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举一反三
【单选题】设 A , B , C 为任意三个集合,下列命题正确的是 ( ) .
A.
若 A È B = A È C ，则 B = C
B.
若 A Ç B = A Ç C ，则 B = C
C.
若 È B = E 且 A Ê B ，则 A = B
D.
若 A － B ＝ Æ ，则 A = B