Which of the following is NOT an effective way for the astronauts to treat the ailments th
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Which of the following is NOT an effective way for the astronauts to treat the ailments they have？
A．To eat vitamin D to strengthen the bones.
B．To have some blood let out to reduce iron.
C．To take exercises to relieve the back pain.
D．To have folate acid to improve the vision.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
细节题。第七段虽然提到大约四分之一从国际空间站返航的航天员有视力方面的问题，且科学家发现这一问题与航天员体内叶酸水平降低有关，但并没有提及吃叶酸能改善视力，只在第六段最后一句提到吃叶酸可以防止辐射导致的基因受损风险的增大，因此选择[D]。