The purpose（目的） of students1 come to school is to study. But2 needs the right way or we would waste the time or the money. The followings are ways for studying.
   The 3time for reading is morning. Because in the morning, the air is fresh and our mind are clear. For that reason, we can get good results
   When we study we must be patient（有耐心的）. If we don't understand a test well, We must read it again. We should not read the next4 we have learned the first one well.
   When we are studying we must put our hearts 5 the book. We can not read absent-mindedly（心不在焉的）, or we could get6 from the book while we are reading.
   We must always ask "why". If it is not7 understand, write it down ask our teacher or parents, brothers or friends, in8 possible way We must know it completely and then our knowledge can be 9well.
   Though there many ways of studying,10, the above mentioned（提到的） be quite enough if we can keep it in heart.      

当你想和同学一起玩儿时，你应该这样说:

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区别人种的主要根据是 (　　)