外研版英语（刘兆义主编）五年级下册 Unit 5 On the beach 课时练习一、单选题1.Today is _________ Day.（ ） A. child B. Children C. Children's2.There ________ no school today. （ ） A. am B. are C. is3.Lucy and her classmates are _______ the beach. （ ） A. in B. on C. at4.They are ______...
