多项选择题
A.充足的睡眠B.充足的营养C.良好的物理环境D.心理上的放松
A.shopB.sidewalkC.cornerD.store
A.To tell how 'high tech' and 'state of the art' have developed.B.To give examples of 'high tech'.C.To tell what 'high tech' and 'state of the art' are.D.To describe very modem technology.