问题：

[单选,材料题]

回答下面的题目：
What is paper made(Example：0__________)?When we 41__________ books or newspapers，we seldom stop and think about the things 42__________ to make them．43__________ paper our lives would be very different．
Paper is one of 44__________importantinventions(发明)of all time．The people in Egypt(埃及)first used a kind of grass—likeplant to 45__________ paper around five 46__________years ago．3000 years later，a Chinese man created a new47__________0f paper using pieces of old cloth．Then forseveral hundred years，peorlle48__________ the world hadbeen using this Chinese method to make paper．In l838，a Canadian man invented a 49__________method of paper—makingusingwood．Today，most of the Paperwe use is made from 50__________．

A . be used
B . used
C . using