Question

1.1 don't think it is polite_you to make  jokes_

the blind people.

A.by ； of B.of  ； about C. with ； in D.at  ； to

Answer 1

B第一空格处是句型"It is+adj. +of/for sb. to do  sth."；第 二空格处是短语make jokes about (意为"拿……开玩

笑"）。