The biggest whale is _____ blue whale, which grows to be about 29 meters long—the height of ____ 9-story building.
A．the; theB．a(chǎn); aC．a(chǎn); theD．the; a
D

試題分析：第一空用定冠詞表類別，特指“藍(lán)鯨”；第二空泛指“一座9層樓那么高”。句意：最大的鯨是藍(lán)鯨，它能長(zhǎng)到29米長(zhǎng)——相當(dāng)于一座9層樓那么高。
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