UNIT 1 WELCOME TO MY SCHOOL! (L1-3)
should(（常用于纠正别人）应该，应当)week(周)study(书房)subject(科目；学科)spend(花费)更多单词 >>
UNIT 2 WHAT'S YOUR HOBBY? (L8-10)
classmate(同班同学)sound(听起来好像)country(国家)young(年轻的；岁数不大的)exercise(活动；运动)更多单词 >>
UNIT 3 THE ENVIRONMENT AND US (L15-17)
penguin(企鹅)balloon(气球)camel(骆驼)kill(v.杀死；弄死)environment(n.环境)更多单词 >>
UNIT 3 THE ENVIRONMENT AND US (L18-21)
young(年轻的；岁数不大的)low(低的)protect(v.保护；防护)recycle(v.回收利用；再利用)reuse(重新利用)更多单词 >>
