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求救:OG-CR第48题, 怎么也理解不了OG的解释,有谁能帮忙解释一下么? A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease. D. Mental illness does not cause people's immune-system activity to decrease. D为答案,但我不理解! |