题目

根据问句选出相应的答语。⑴What's this? A. It's a book.⑵What colour do you like？ B. My name's Guo Yang.⑶How are you? C. I'm fine, thank you. ⑷What colour is it? D. It's red, blue and white.⑸What's your name?E. I like green. 答案：【1】A【2】E【3】C【4】D【5】B如图，在△ABC中，∠BAC的平分线交BC于点D，E是边AC上的一点，且AE=AB，EF∥BC交AD于点F，求证：四边形BDEF是菱形．