题目内容：
回答题：If you wish to become a better reader，here are four importantpoints to remember about rate，or speed，of reading：
1．Knowing why you are reading--what you are reading to find out—will often help you to know whether to read rapidly or slowly．
2．Some things should be read slowly throughout．Examples are directions for making or doing something，arithmetic problems，science and history books, which are full of important information．You must read such things slowly to remember each important step and understand each important idea．
3．Some things shouId be read rapidlY throughout．Examples are simple stories meant for enjoyment，news，letters from friends，items，or bits of news from local，or hometown，paper，telling what is happening to friends and neighbors．
4．In some of your readings，you must change your speed from fast to slow and then to fast，as you go along．You need to read certainpages rapidly and then slow down and do more careful readings when you come to important ideas which must be remembered．
According to the passage．your reading speed depends on__________． A．whether the reading material is easy ordifficult
B．what you are reading
C．what your purpose in reading something is
D．both B and C
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