A. system B. direction 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 worked together

5. the position a person or thing moves or points towards

1._______  2._______  3._________

4._______  5._________

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