To stay warm in cold weather, cold-blooded animals must expose itself to a source of warmth such as direct sunlight.
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【正确答案】 1、正确答案：itself—themselves    
【答案解析】解析：考查代词数的一致。代词在人称和数上应与其所指代的名词一致。此处代词指代的是复数cold-blooded animals，故该反身代词也要用复数themselves。