A rats sharp teeth can gnaw through wood plaster or soft metallic such as lead.
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A rats sharp teeth can gnaw through wood, plaster, or soft metallic such as lead.
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正确答案：metallic—metal
考查词性。连词or两边的成分应同词性、同形式。此处应用名词与wood和plaster并列，metallic是形容词，应改为名词metal。另外，短语suchas后的名词lead也暗示它前面的词应是名词。