与下边漫画所揭示的哲理相吻合的俗语有

①要知梨子味，需得亲口尝               ②路遥知马力，日久见人心

③与其临渊羡鱼，不如退而结网            ④空谈水之泡沫，实行金之点滴

A．①③

B．①④

C．②③

D．③④

The teachers always complain about         the         children in class.

A．to teach, tired

B．teaching, tired

C．teaching, tiring

D．to teach, tiring