【简答题】已知数列{a n }和{b n },a n =n,b n =2 n ,定义无穷数列{c n }如下:a 1 ,b 1 ,a 2 ,b 2 ,a 3 ,b 3 ,…,a n ,b n ,… (1)写出这个数列{c n }的一个通项公式(不能用分段函数) (2)指出32是数列{c n }中的第几项,并求数列{c n }中数值等于32的两项之间(不包括这两项)的所有项的和 (3)如果c x =c y (...
【单选题】What does the author mean by saying '...the Jews, the Muslims—had lower disease and death rates; which did not always count to their advantage' in Paragraph Four?
A.
The zealous religious belief of the Jews and the Muslims delayed their adoption of industrial innovation.
B.
The Jews and the Muslims were often accused of conspiracy because their low disease and death rates were seen as suspicious.
C.
No washable underclothing was available for the Jews and the Muslims at that time.
D.
The Jews and the Muslims had other unhealthy habits despite their cleanliness.