在我们的学习中，采用对比联想的方法往往能起到事半功倍的效果．请你回想一下，菜豆种子中与鸟卵的卵黄功能相似的结构是（ ）
A：胚
B：子叶
C：胚根
D：种皮
读句子，将问句和答句连线。
①Whose dress is it? ____ A. It's pink.
②What colour is the shirt? ____ B. It's under the sofa.
③Is this your shirt, Dad? ____ C. No, it isn't.
④Where's my hat? ____ D. It's my sister's.
