题目内容

A．differencesB．classesC．classificationsD．organizations

A. differences
B. classes
C. classifications
D. organizations

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A．highlyB．tightlyC．deeplyD．narrowly

A. highly
B. tightly
C. deeply
D. narrowly

A．wholeB．everyC．particularD．comprehensive

A. whole
B. every
C. particular
D. comprehensive

A．closedB．secretC．privateD．confidential

A. closed
B. secret
C. private
D. confidential

等比数列{an}中的前n项和为Sn，已知S1，2S2，3S3成等差数列，则{an}的公比为()．

A. 2
B. 1/2
C. 3/2
D. 3
E. 1/3