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A. system   B. explorer C. invention D. mark   E. man-made

1. to write or draw a symbol,line,etc. on sth. in order to give information about it

2. a thing that has been invented

3. made by people , not natural

4. a group of things that are connected or work together

5. a person who travels to unknown places in order to find out more about them

1.______  2.______  3._______

4.______  5._______

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