要是没有先驱们在科技上的这些尖端突破，不管这些突破是侥幸的还是计划之中的，今天我们所知道的世界就会是一个完全不同的地方。

　　5．This marked the beginning of the “space race” between the US and the USSR，which ended with the US putting a man on the moon in 1969.

　　这标志着在美国与苏联之间的“太空竞赛”开始了，这场竞赛以美国在1969年把人类送上月球而告终。

　　Ⅳ.课文语法填空

　　Over the centuries, masses of people have wondered about the future.Some imagine 1.what the world will be like in the future.Some authors even predict things that have since happened.2.However，for some people，3.thinking(think) about the future is not just for fun.They plan the future of the world for a living,4.who are called futurologists.A seminar will be held at Newcastle University this weekend.Lots of people will attend it with the hope of starting new enterprises 5.based(base) on the 6.predictions(predict) they will hear at the meeting.I clicked into the websites of a few futurologists and learnt some predictions.Here are some：

　　In the next few years，computers will become 7.handier(hand)．

　　By the year 2025，no one will die of 8.starvation(starve) because there will be food for everyone.

　　By the year 2030，people 9.can live for at least 150 years.Tiny robots may be sent around the cells of our bodies to assess our health and carry 10.out repairs to keep us healthy.

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