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【简答题】
根据所给邀请函内容选择合适的信息为 Mike Smith 写一封接受邀请的回信 : 邀请函: Dear Mike, My brother John will be staying with us for a few days during the Christmas Holidays. M y wife and I have planned a family dinner for him at seven o ’ clock next Saturday evening. Many of our friends will come to the party. W e should be very happy if you could join us. I hope you will let me know in advance if you can come. Best wishes, Peter Brown 所给内容: ◆ next Saturday evening ◆ Dear Peter ◆ I look forward to meeting you soon ◆ Thank you very much for your invitation ◆ Mike Smith 回信: 1 , 2 . It will be a gre at pleasure for me to join you 3 . I will arrive at your house before seven. And I am sure we ’ ll have a great time together. 4 . Thank you! Love, 5
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【简答题】已知等比数列{a n }满足a 5 a 6 a 7 ＝8，则其前11项之积为________．
【简答题】已知等比数列{a n }满足a 5 =2a 4 ，a 2 =1，数列{a n }的前n项和S n ，则S 6 =______．
【简答题】正弦波振荡器的振荡频率由 ____________ 而定。
【单选题】已知等差数列{a n }满足：a 1 +a 3 =8，S 5 =30，若等比数列{b n }满足b 1 =a 1 ，b 3 =a 4 ，则b 5 为（ ）
A.
16
B.
32
C.
64
D.
27
【单选题】已知等比数列{a n }满足a 1 =3，且4a 1 ，2a 2 ，a 3 成等差数列，则a 3 +a 4 +a 5 =（ ）
A.
33
B.
84
C.
72
D.
189