A:额尔齐斯河
B:黑龙江
C:怒江
D:雅鲁藏布江
It's good _____ you to keep a diary.
将函数y=f(x)·sinx的图象向右平移π4个单位后,再作关于x轴的对称变换,得到函数y=1-2sin2x的图象,则f(x)可以是 ( ).
I'll goes to the park tomorrow.
应用题