【題目】We are now flying at an(海拔)of 15,000 meters.

【答案】altitude
【解析】句意:我們現(xiàn)在飛行高度為15000米。at an altitude of固定短語,“在......的高度,海拔高度有......”。根據(jù)題意,應(yīng)填名詞,故填altitude。

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