在海边眺望驶近的帆船,总是先看到桅杆,再看到船身。其原因是( )
A:桅杆比较高
B:地球是一个球体
C:海水在不停地涌动
D:桅顶通常有明显的标记
⑴You need a swimming cap. ____
⑵First,you should wash yourself. ____
⑶Next,you should do warm-up exercises. ____
⑷Then, you can enjoy your swimming lessons. ____
⑸You need a swimsuit.____
A. B. C. D. E.
与我国云南省相邻的国家是:( )