抛物线y=2(x-1)2-3的对称轴是直线( )
A.x=2
B.x=1
C.x=-1
D.x=-3
根据题意得x=1.
故选B.
_______ is a beautiful country. [ ]
A. Tibet
B. Hong Kong
C. Spain
D. Hawaii
保障措施的实施期限一般不超过( )年。
A.2
B.4
C.5
D.8