When he was alive, the old scientist used to say that knowledge ＿＿from practice and he gained his experience by doing a lot of practical work

____ by taking part in practice can the young people be toughened and hardened into steel

下列句子中，没有语病的一项是( )

We’re going to have a basketball match with Class1.—________!

1— Who’s that lovely girl?— You mean______ girl with long hair? That’s Kate.