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【单选题】
在一次读书活动中,有 5 本不同的政治书, 10 本不同的科技书, 20 本不同的小说书供学生选用,某学生若要从这三类书中各选一本,则有( )种不同的选法.A.
35
B.
36
C.
100
D.
1000
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