A:①②
B:①③
C:②③
D:①④
选出所给句子的答句,将其字母代号填在括号内。
①What time do you go home?____ A. Thank you.
②Where is Miss Li?____ B. At four.
③Do you like puppets?____ C. Yes, I do.
④Whose jeans are they?____ D. They're my father's.
⑤Here's a kite for you.____ E. She's in the classroom.
工人师傅在用方砖铺地时,常常打两个木桩,然后沿着拉紧的线铺砖,这样地砖就铺得整齐,这个事实说明的原理是____