If you asked people what the most important invention has been,many would say the printing press. Others _1_ say the wheel.But even though it’s_2_whether the appearance of the printing press affected the course of history more than the wheel，the printing press _3_ within the top two or three inventions in history. _4_ the telephone, the television,the radio, and the computer,the written word was the only way to _5_ ideas to people too far away to talk with.Until the 6th or 7th century,all books had to be written _6_.Creating a book was difficult，and very few existed.Therefore，very few people read books. In the 6th and 7th centuries, the Chinese invented a way to print pages by _7_ characters and pictures on wooden，ivory，or clay blocks.They would print a page from the block by putting _8_ on the block and pressing paper onto the ink.This _9_ is called letterpress printing.The invention of letterpress printing was a great advance in communication _10_ each block could be inked many times and many copies of each page could be made.Many books could now be made.Therefore，many people could read the same book. 1.A.might     B.ought to     C.had to     D.should 2.A.variable   B.agreeable    C.reliable    D.debatable 3.A.lists     B.ranges      C.ranks      D.covers 4.A.Now that   B.No longer    C.Long before  D.Since then 5.A.invent    B.communicate   C.generalize   D.motivate 6.A.by hand    B.at heart    C.on foot     D.in mind 7.A.drawing    B.painting    C.writing     D.carving 8.A.chalk      B.oil       C.ink        D.crystal 9.A.definition  B.action      C.movement    D.process 10.A.when     B.because      C.although    D.if