A：柠檬汁（2～3）
B：橘子汁（3～4）
C：西瓜汁（5～6）
D：牙膏（8～9）
⑴Can we look at the blue jeans?____ A. It's a shirt.
⑵What's this?____ B. They're shorts.
⑶What colour is it?____ C. Here you are.
⑷What are they?____ D. It's yellow.
下列全为遗传病的一组是（ ）
