9. What was the most important key to preventing Eiffel Tower from being torn down?
(A) Turning it into a memorable structure for sending radio and television signals
(B) Promoting it as a symbol of romance for tourists from around the world
(C) Getting a popular nickname that boosted public fondness and support
(D) Allowing scientists to conduct many sorts of observations and experiments

 The Tower was initially intended to be demolished about 20 years after the exposition. Gustave Eiffel, who designed and oversaw the building of the Tower, knew then that its scientific uses could protect it from its adversaries and prolong its lifespan. He therefore specified and pushed for the Tower’s purposes: meteorological and astronomical observations, physics experiments, optical telegraph communications and wind studies. Finally and decisively he succeeded in saving the Tower by putting it forward as a monumental support antenna for wireless broadcasting.

該塔最初打算在世博會後大約 20 年拆除。 設計和監督塔樓建造的古斯塔夫·埃菲爾 (Gustave Eiffel) 那時就知道，它的科學用途可以保護它免受敵人攻擊並延長它的使用壽命。 因此，他明確並推動了塔的用途：氣象和天文觀測、物理實驗、光電報通信和風力研究。 最後，他果斷地把塔作為無線廣播的天線，成功地挽救了它。