Let us _____________.[ ]
A. counting
B. count
答案:B
二次函数y=x2-2x+3的对称轴为[ ]
A.x=-2
B.x=2
C.x=1
D.x=-1
All his friends’ encouragement _____ his confidence in winning the game.
A.added up to
B.added up
C.added to
D.added