A：2x－27
B：8x－15
C：12x－15
D：18x－27
①子叶 ____ A、发育成根
②胚轴 ____ B、发育成茎和叶
③胚芽 ____ C、脱落
④胚根 ____ D、发育成连接根和茎的部分
⑤种皮 ____ E、逐渐消失
Which of the following words matches the sound /'sɪŋɡl/?
句子配对
____Is this your school? A. It's in the kitchen.
____Where is your cat? B. Yes, it is.
____Where are your books? C. No, he isn't.
____Is he in the kitchen? D. Yes, they are.
____Are they near the phone? E. They are under the table.
