选择题：The sayings mentioned in the text were witten by.A

题目内容：
The sayings mentioned in the text were witten by.
A. A. Franklin himself
B. B. Franklin and Poor Richard
C. C. one of Franklin. s friends
D. D. various writers
参考答案：

一盒产品中有a只正品,b只次品,有放回地任取两次,第二次取到正品的概率为( )A、a-1/a+b-1

一盒产品中有a只正品,b只次品,有放回地任取两次,第二次取到正品的概率为( )A、a-1/a+b-1 B、a(a-1)/(a+b)(a+b-1) C、a/a+b

分类：乐山师范学院第二外语(英语）.  题型：选择题
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