人类原先使用的冰箱、冰柜和空调排放的氟氯烃不易分解，最后破坏臭氧层，给地球环境和人类健康带来极大危害，现在冰箱厂家投入较多资金和技术研究开发无氟冰箱、冰柜等“绿色环保产品”。生产“绿色环保产品”体现了环境伦理的下列原则(　　)
①环境正义原则　②尊重自然的原则　③平等互利原则　④可持续发展原则

把下面的图片与所给的描述对号入座。
A        B          C 
D                E
____ He is of medium height and build, with two small eyes. He is a pop singer. And he likes playing basketball very much. He is very popular with young people.
____ He is short and of medium build. He has short black hair. He is a funny actor.
____ She is heavy. She has short brown hair. She always wears glasses. She sings very well.
____ He is very tall and has short black hair. He is a basketball player, and he plays it very well. Now he is a college student in Shanghai Jiaotong University.
____ She is thin, with long black hair and big eyes. She is a movie star. She is in the play "Palace", and she is very popular with young people.

如图是某同学探究唾液淀粉酶对淀粉消化的实验操作过程，下列各项关于实验结果的描述中，正确的是（    ）