题目

从II栏中选出与I栏相对应的答句,将其序号填入题前括号内。 Ⅰ Ⅱ(_____) 1. Can I open the box, Mum? A. I’m looking for my keys.(_____) 2. Is your mother’s birthday in July? B. There are twenty.(_____) 3. What are you doing? C. Yes, I do.(_____) 4. When’s your birthday? D. Sure.(_____) 5. Do you have the answer? E. My birthday is on the ninth of May.(_____) 6. How many girls are there in your class? F. No, her birthday is in December.将函数y=cos2x的图象向右平移个单位长度,再将所得图象的所有点的横坐标伸长到原来的2倍(纵坐标不变),得到的函数解析式为( ).A.y=sinx B.y=-cos4x C.y=sin4x D.y=cosx  
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