直线y=2x+1的参数方程是 ( )
A:x=t2y=2t2+1
B:x=2t-1y=4t+1
C:x=t-1y=2t-1
D:x=cosθy=2sinθ+1
左____右____ 大____大____ ____ ____大叫
____ ____不安 一____不____ 三____一____
____ ____而去 ____ ____如也 从____不____