考高分5.Mary wrote an article on _____ the team had failed to win the game.
A.why
B.what
C.who
D.that
考高分6.Elephants have their own way to tell the shape of an object and ____smooth.
A./
B.whether
C.how
D.what
考高分5.答案是A;介词on后接宾语从句。根据句意选A。
考高分6.答案是B;根据下文it is rough or smooth的暗示，此处选whether。
