题目内容
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
| A．it, it | B．what, what | C．it, what | D．what, it |
C
解析试题分析：考查it做形式主语和主语从句的用法：句意：每个人都知道玩火是危险的，但是很难阻止孩子玩火。第一空填形式主语真正的主语是其后的不定式 to play with fire而第二空应填 whatwhat is difficult 是主语从句注意 what is difficult 后的谓语动词是is。选C
考点：考查it做形式主语和主语从句的用法
--- Why is the cake so expensive?
---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice.
| A．one | B．that | C．the one | D．another |
The population of China is larger than ______ of any other country in the world.
| A．that | B．it | C．one | D．this |
— Oh, dear! We only have 15 minutes to get to the station.
— So terrible! There isn't any taxi around when you want ______.
| A．it | B．that | C．this | D．one |
The letter was passed from one to until everyone had read it
| A．the other | B．others | C．other | D．another |
The doctor thought ____ would be good for you to have a holiday.
| A．this | B．that | C．one | D．it |
—Who knocked at the door?
—I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ____ was.
| A．he | B．that | C．she | D．it |
Have you ever been to Mount Huangshan, _____ is famous for its towering pine forests and "sea of clouds"?
| A．which | B．where | C．that | D．what |