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1. Benjamin Franklin flew a kite during a storm. He invented it to protect buildings from lightning safely.
2. The Wright Brothers learnt from practising and never lost hope. At last they finished the first successful flight.
3. Zhang Heng spent years studying the sky and the earth. He drew China's first star map and invented the first one.
4. Spencer Silver and Arthur Fry thought the glue was perfect for sticking notes to books.
1. Benjamin Franklin flew a kite during a storm. He invented it to protect buildings from lightning safely.
2. The Wright Brothers learnt from practising and never lost hope. At last they finished the first successful flight.
3. Zhang Heng spent years studying the sky and the earth. He drew China's first star map and invented the first one.
4. Spencer Silver and Arthur Fry thought the glue was perfect for sticking notes to books.
答案：
1. A
2. D
3. B
4. C
2. D
3. B
4. C
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