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Answer: We believe the sentence is best completed this way:

“The towering new skyscraper reached heavenward on its steely spine, around which the structure swayed like bamboo stalks in the wind.”

The sentence is about the architecture and stability of a modern tall building. One method to provide structural integrity to such buildings is to give them a core of steel beams that provides rigidity and yet has the capacity to flex in the event of tectonic or atmospheric events. In completing the sentence, the writer is asked to describe this flexing. An allusion to just about any vertical living plant might do, but the bamboo seems particularly apt because some varieties grow upward as a single stem before flowering, not unlike skyscrapers that reach high before being adorned with exterior materials—except that bamboo rise a lot more quickly.
本句形容現代摩天大樓的結構與穩定性，這類建築要保持結構完整，一個方法就是以鋼樑為建築骨幹，除了堅固，在地震與氣候變化時還可以彎曲。完成這個句子必須傳達出這種彈性；任何垂直生長的植物都可以用來比喻，不過竹子特別適合，因為有些品種的竹子開花前，會以單一莖幹向上生長，與摩天大樓先向上蓋，然後再修飾外部的狀況並無二致－只不過竹子往上長的速度快得多了。