A：细胞核
B：线粒体
C：细胞膜
D：叶绿体
根据拼音写出相应词语
人属于生态系统中的什么成份
读一读，连线。
①What can you see?____ A. It's green.
②What colour is it?____ B. OK, Mum.
③Put the box on the desk. ____ C. Yes, please.
④Chopsticks?____ D. I can see a slide.
