It’s 9:00 in the evening. The family are at home. Jim’s father sits in a chair. He’s watching TV(看电视). His mother stands near the window. She feeds(喂) the birds—Polly. Polly says, “Thanks! Thanks!” Where is Jim? Oh, he’s behind the door. Kate is looking for(找) him. They play games in Kate’s room.

下列自动调节能力最强的生态系统是（  ）

 战后美国新经济时代的主要特征是信息化和全球化。