43. According to the passage, which of the following is NOT a sign of animals’ intelligence?
(A) They know how to use tools.
(B) They have the ability to build nests.
(C) They make a plan to solve their problem.
(D) They use human language to communicate.
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（A）他們知道如何使用工具。 （B）他...
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43.【題組】43. According...
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