Tom can play the guitar, he can't play it .
A:or; good
B:and; well
C:but; good
D:but; well
体重480N的小明同学用力将重100N的口袋沿着长6m的楼梯背上高3m的二楼,后又沿着水平走廊向前走10m,则他在这两个过程中先后对口袋做的功是____ J和____ J。
如图为人体排泄有关的主要器官结构示意图,请据图回答:
—— ________ is she ____________ ?——Her husband and her children.