题目内容
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._________
l.D 2. C 3.E 4. A 5. B
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