题目

Dear Lucy， Thanks for your letter.I might get use to the life in American gradually.Food here remains the same all day and the school here is more relaxed though I take 2 AP courses and have to catch up with half year's courses.All the books are in English and I have to write many articles，that might seem difficult.Much more worse，I find out my oral English retrograde(倒退的)．I have been out of my school only once，and I guess there are a lot of differences.There are some funny clubs，and I participate the basketball club in this semester.It's amazing.By the way，thank y将函数y=sin2x的图象向左平移π4个单位，再向上平移1个单位，所得图象的函数解析式是（　　） A、y=2cos2xB、y=2sin2xC、y=1+sin(2x+π4)D、y=cos2x