A:①④
B:②③
C:②④
D:①③
x
0
1
2
3
y
k
3.35
5.65
8.2
—What do you think of your trip to Hainan?
—Great. We were all _______ with the _______ trip.
两个相似三角形的面积比为1∶4,那么这两个三角形的周长比为( )
为了揭示大自然的奥秘,无数科学家进行了不懈的探索。下列说法错误的是( )