在下面四种正多边形的瓷砖中,用同一种瓷砖能镶嵌成一个平面图案的是
A.①②③
B.①②④
C.①③④
D.②③④
答案:B
She looked at me ______ great surprise and asked after a long while, “Did you leave for Beijing this morning?”
A.at
B.in
C.of
D.on
影响创造性的因素主要有( )
A.环境
B.智力
C.个性
D.天赋