下列不属于旧机电产品的是 ( )
A.旧钢轨
B.旧打印机
C.旧电饭锅
D.旧车船
参考答案:A
— Where are Maria and Kangkang ? — They aren’t here. They ________ England.
A. have been to B. have been in C. have gone to
三室模型包括中央室、 __________ 、 __________ 。