问答题

According to the last paragraph, in the future, there are probably more
A.twin sisters than twin brothers.
B.twin brothers than twin sisters.
C.single-sex twins than boy-and-girl twins.
D.boy-and-girl twins than single-sex twins.

A.twin
B.
B.twin
C.
C.single-sex
D.
D.boy-and-girl
E.
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