A．workbookB．textbookC．words
A. workbook
B. textbook
C. words
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A．In a music mailing club.B．In a class of German culture.C．In a discussion group on th
A. In a music mailing club.
B. In a class of German culture.
C. In a discussion group on the Internet.
D. In a seminar on the German language.
(153．513)十=(________)八。
A. 267．54
B. 352．5
C. 231．406…
D. 以上都不对
本期应交所得税等于本期利润总额乘以所得税税率。 ()
A. 正确
B. 错误
数列{an}的前n项和Sn=n2+2n+5，则an+1+an+2+an+3=()
A. n2+6n
B. 6n+15
C. n2+6n+15
D. 6n
E. 以上答案均不正确
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