根据短文内容，选择正确答案。  

    Here is a photo. The two girls have big blue eyes and long brown hair. They are both ten years old. They are in the same class. The one in a yellow skirt is Lily. The other one (另一个) an orange skirt is Lucy. Their father (父亲) is Mr. White. He is in a brown coat. Their mom is Mrs. White. She is in a black dress. Who is that boy in a blue cap? He is Lucy and Lily's brother(哥哥), Bob. He is a high school student. Look! Lucy and Lily are in a green car.

在美国，学生课本重复使用，一本教科书平均寿命五年；在韩国，一次性台布、洗刷用品早已没有踪影；在日本，发明了一次性筷子，但严禁砍伐本国树木做筷子。这给我们的启示是 （  ）    
① 必须节约资源           ②必须发展生产力 
③必须实施可持续发展战略  ④ 坚持对外开放 

细菌与真菌、动植物细胞相比，虽有____ 集中的区域，却没有成形的____ ，这样的生物称为原核生物．

下列近代中国与西方列强签订的不平等条约中规定开放通商口岸数量最多的是