二手车也受到热捧，有一位想要买二手汽车的消费者说“新车上了牌之后也就成为了二手车，对我来说，汽车只是一种为我服务的工具，新旧无所谓，关键质量要好，价格要实在。”从消费心理上看这属于（   ）

“保证各国在华‘机会均等’，对外‘门户开放’”这一内容出自下列哪个文件？（　　）

    In the future，life will be much ____. Maybe there will be vision phones in every ____. People can have a medical examination without a ____ or nurse in the room and do some shopping without ____their homes. And what ____education? There will be ____educational programs on the radio or TV. So many children who live in far-away villages don't need to ____to school every day. They can study at home. Each family has a robot. Robots will ____ people do their housework. Perhaps some people will fly to the ____for a holiday and some people can live under the ____.

（1）如图所示，是地球上的人利用卫星进行通信的示意图，结合示意图，简要说明卫星通信的原理．

（2）现在许多长途电话是以地球同步卫星做中继站的．打这种长途电话时，会感到对方的反应有些延迟．造成这种延迟的原因之一是无线电波在射向卫星和从卫星返回时需要一定的时间．假设某人造卫星与地球的距离是36000km，请你估算延迟的时间．

美国科幻小说《侏罗纪公园》描述了一些不负责任的科学家和唯利是图的商人，从一块琥珀的蚊子体内找到了恐龙的遗传物质DNA从而制造出许多活的恐龙，结果把一场灾难带给人类的恐怖场景。“复制DNA制造出活的恐龙”这一技术是（    ）