题目

数列中，，，则  ( ) A．1         B．2       C．3            D．4 答案：B 解析：a10＝(a10－a9)＋(a9－a8)＋…＋(a2－a1)＋a1＝lg＋lg＋…＋lg＋1＝lg＋1＝2.故选B.Daniel taught himself on the computer.A. how to search for information B. what to search for informationC. how to searched for information D. what to searched for information