抛物线y=3（x-1）2+2的对称轴是[ ]
A.x=1
B.x=-1
C.x=2
D.x=-2
答案：A
5个人之间，每两个人握一次手，共握手（ ）次。
Jane _____ a lot of Spanish when playing with the native boys and girls. [ ]
A. took up
B. picked up
C. made up
D. turned up
