第二段用spider 举例，意为揭示动物具有 A: instinctive behavior B: learned behavior C: both D: neitherneither
第二段用spider 举例，意为揭示动物具有 A: instinctive behavior B: learned behavior C: both D: neitherneither
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第二段用spider 举例，意为揭示动物具有 A: instinctive behavior B: learned behavior C: both D: neitherneither