explore, mark , find out, system, use, direction, man-madeThanks lo the Global Positioning1 (GPS) . we can exactly know where we are now. It can be2 in any place and any weather condition to find thei 题目和参考答案——青夏教育精英家教网—

explore, mark , find out, system, use, direction, man-made

Thanks lo the Global Positioning1 (GPS) ， we can exactly know where we are now. It can be2 in any place and any weather condition to find their position by 3 . In the past，they had to use the stars in the sky as 4 to tell them where they were. However，this melhod didn't work very well when the weather was bad. So the GPS is like a 5 "star".it is a great invention that can

help us to better explore our planet.

1._______ 2. 3. 4._____________ 5.

1. System 2. used 3. explorers 4. marks 5. man-made

题目来源：仁爱英语同步练习簿九年级上下册 > Topic 1 When was it invented？

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