已知{an}为等差数列，a1+a3+a5=105，a2+a4+a6=99，以Sn 发布时间：2017-05-03 02:45 │ 来源：www.tikuol.com 题型：选择题 问题： 已知{an}为等差数列，a1+a3+a5=105，a2+a4+a6=99，以Sn表示{an}的前n项和，则使得Sn达到最大值的n是[ ]A.18 B.19 C.20 D.21
题型：选择题 综合填空。think, sell, no, many, too, old, understand, future, everyday, use Computers are very important to modern life. Many people think that in the 1_____ computers will be used in lots of 2_____ life. It is 3_____ that we won't have to go shopping because we will be able to get most things which are 4_____ in shops on the Internet. There will be 5_____ more books because we will be able to get all text from computers. The Internet will be 6_____ to play games, see films and buy food. 7_____ telephone calls will be made by computers, 8_____ Some people are glad about these new ways of shopping and communicating. Others don't 9_____ that computers will replace our 10_____. 查看答案
题型：选择题 問題1 では、まず質問を聞いてください。それから 話 を聞いて、問題用紙の 1 から 4 の中から、最 もひと えらよいものを一つ選んでください。A．パッケージのデザイン B．クリームの種類C．一箱に入れるクッキーの量 D．販売価格 查看答案
