To stay warm in cold weather cold－blooded animals must expose itself to a source of warmt
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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：itself—themselves
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-bloodedanimals，故该反身代词也要用复数themselves。