The observations garnered from two independent research studies corroborate the theory that crows have a tremendous intellectual capacity; the studies show crows as capable of understanding basic causal relationships—a capacity that puts them on the same level as a human seven-year-old—and to create independently their own tools.
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Acrows as capable of understanding basic causal relationships—a capacity that puts them on the same level as a human seven-year-old—and to create independently
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Bcrows’ capacity to understand basic causal relationships—a capacity putting them on the same level as a human seven-year-old—and independently creating
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Ccrows to be capable of understanding basic causal relationships—a capacity that puts them on the same level as a human seven-year-old—and to create independently
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Dthat crows have the capacity of understanding basic causal relationships—a capacity putting them on the same level as a human seven-year-old—and independently creating
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Ethat crows are capable of understanding basic causal relationships—a capacity that puts them on the same level as a human seven-year-old—and independently creating
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正确答案: E