已知等差数列{a n }的首项a 1 =1,公差d>0.且a 2 ,a 5 ,a 14 分别是等比数列{b n }的b 1 ,b 2 ,b 3 . (Ⅰ)求数列{a n }与{b n }的通项公式; (Ⅱ)设数列{C n }对任意自然数n均有 c 1 b 1 + c 2 b 2 +…+ c n b n =a n+1 成立,求c 1 +c 2 +…+c 2013 的值.
【单选题】Although most of us believe that we communicate almost exclusively with words, research has shown that nonverbal communication is at least as important. Gestures and tone of voice are important cues i...
A.
dogs and humans communicate the same way.
B.
gestures and tone of voice convey a great deal of information.
C.
our system of communication is changing rapidly.
D.
only human beings are capable of verbal communication.