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Beef is an excellent material of iron.
A: beginning
B: storage
C: source
D: substance
B: storage
C: source
D: substance
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参考解析
解析：句意：牛肉是铁元素的最佳来源。A项beginning意为“开始”;B项storage意为“贮存”;C项source意为“来源”;D项stance意为“物质”。C项和画线部分同义。故选 C项。
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