When does Thanksgiving Day fall？
A. It falls on Oct 30.
B. It falls on Dec 24.
C. It falls on March 21.
D. It falls on the fourth Thursday of November.
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设a，x，y，b依次成等差数列，c，x，y，d依次成等比数列，其中y＞x＞0，则有()．
A. (a+b)2=2cd
B. (a+b)2＜2cd
C. (a+b)2＞4cd
D. (a+b)2＜4cd
E. 以上答案均不正确
听力原文：Help yourself to some fish, please!
(5)
A. I can't help you.
B. I will help you to eat the fish.
C. I like eating fish.
D. Thanks a lot.
三个不相同的非零实数a，b，c成等差数列，又a，c，b恰成等比数列，则a/b=()．
A. 2
B. 4
C. -4
D. -2
E. 3
已知数列{an}的前n项和Sn=3+2n，则这个数列是()．
A. 等差数列
B. 等比数列
C. 既非等差数列，又非等比数列
D. 既是等差数列，又是等比数列
E. 无法判定
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