请选择以下单词的同义词A. rocketedB. elevatedC. ascendedD. amplified

本题考查对单词同义词的掌握。解题思路是先明确每个选项单词的含义，再找出与题目中未给出但答案所对应的单词意思相近的选项。

• A选项“rocketed”：作动词时，意为“迅速增加；猛涨；飞速移动” ，例如 “The price of houses has rocketed in recent years.（近年来房价猛涨。）”
• B选项“elevated”：作动词时，有“提升；举起；使升高”的意思，比如 “The platform was elevated to a suitable height.（平台被提升到了合适的高度。）”
• C选项“ascended”：是“ascend”的过去式和过去分词形式，意为“上升；攀登；升高”，例如 “The balloon ascended slowly into the sky.（气球缓缓升上天空。）”
• D选项“amplified”：是“amplify”的过去式和过去分词，意思是“放大；增强；扩大”，例如 “The speaker amplified his voice so that everyone could hear him.（演讲者提高嗓门，以便大家都能听到他讲话。）”

由于答案是A选项，推测题目中未给出的单词意思与“rocketed”相近，即有快速上升、猛增等含义。