[单选题]

27． Expert's view proves(证明) that ___________．
A．boys are faster and smarter than girls
B．girls are smarter sometimes
C．young boy chimps are clever
D．young girl chimps know． everything

27． Expert's view proves(证明) that ___________．A．boys are faster and smarter than girlsB．girls are smarter sometimesC．young boy chimps are cleverD．young girl chimps know． everything