1.已知集合A={xy=x+1},B={yy=x2+1},则集合A∩B=A.{0,1}B.{(0,1),(1,2)C.{1,2}D.[1,+∞)2.已知复数=满足z·(1-i)=-4(i为虚数单位),则||=A2B.2C.22D.43.已知数列{an}对任意的m,n∈N,满足am+=an+an,且a4=6,则as=A15B.7c.7172D.34.若sin(+a)=-,且a不是第二象限角,则tana=AB512D.-12