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六级练习2013.07.09


       
       




How can you tell which direction? By day, look for the Sun. _____________________________________________. At night, use the Big Dipper to help you find the North Star. It would be better to bring a compass because its needle always points north.
How do you know how far you have gone? ____________________________. Each step is about two feet. You’d better wear a pedometer which is a tool that counts steps. If you know where you started, which direction you are heading, and how far you have gone, you can use a good map to figure out exactly where you are.
Today there is a new way for travelers to figure out where they are. It is the GPS. It has 24 satellites that orbit the earth and ________________________. Someday you may carry a small receiver as you hike and use GPS to find out if you are there yet!




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1.It is  the east in the morning and  west in the afternoon
2. You could count every step
3.costantly broadcast their positions

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it's in the east in the morning and west in the afternoon.
you could count every step.
constantly broadcast their positions.

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