A:48π×32360
B:48π(52−32)360
C:48π(5−3)2360
D:48π(82−32)360
例:do——did
①am/is____ ②get____ ③buy____
④see____ ⑤learn____ ⑥decide____
⑦give____ ⑧thank____ ⑨are____