严复被赞誉为“放眼世界，又葆有纯正中国心”。他的主要成就是（  ）       

“叶在光下制造淀粉”的实验中，叶片经酒精脱色并滴加碘液后，遮光和不遮光部分显示的颜色分别是（　　）

看图，读一读，将字幕的序号填在横线上。

A. I like July.It's hot and sunny in July in Shenzhen. We can go to the beach.

B. In Australia, Christmas is in summer. Father Christmas wears shorts.

C. It's windy and cold in July in Sydney.

D. Hello, I'mTom. I like winter. I can skate in winter.