The new_not always betterthan the old,just as the young__not necessary wiser than the old.

问题描述:

The new_not always betterthan the old,just as the young__not necessary wiser than the old.
is/are.

前面用单数,is ,the new表示一类事物,抽象概念,用单数.
后面用复数,are,the young表示一类人,指可数,相当于the young people,用复数.
句意:新的东西并不比旧的好,就像年青人没有必要比老年人聪明一样.