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.
89×516+(716−14)÷12 =____
封建亲戚,以藩屏周。如下图所示,反映了我国古代什么制度( )