A:《大唐西域记》
B:《徐霞客游记》
C:《东游记》
D:《西游记》
若C202n+6=C20n+2n∈N*,且2-xn=a0+a1x+a2x2+⋯+anxn,则a0-a1+a2-⋯+-1nan ( )
—Interesting! And I like my English teacher very much.
— The boy can speak both English and Japanese he is only ten.
— Wow, what a clever boy!