4.Look at the picture marked NO.4 in your textbook.
4.看课本中标注着"4"的图片。
(A)He's talking on the phone.
(A)他在打电话。
(B)She's typing a letter.
(B)她在打一封信。
(C)They're eating lunch.
(C)他们在吃午餐。
(D)He's shopping.
(D)他在购物。