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
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In which of the following ways will one most probably cause trouble？
A. Making faces in telephone conferences.
B. Giving negative replies in email.
C. Talking for a long time face to face.
D. Writing a memo in a formal way.
给付定金的一方不履行约定债务的，无权要求返还定金；收受定金的一方不履行约定债务的，应当返还定金。 ()
A. 正确
B. 错误
甲以一台笔记本电脑出质于乙，同时约定由甲代为保管。根据规定，该质押权应认定为尚未设立。 ()
A. 正确
B. 错误
A．jointlyB．mutuallyC．connectinglyD．sharingly
A. jointly
B. mutually
C. connectingly
D. sharingly
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