翻译:"after some reading,blink your eyes for a few seconds.close them tightly.

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• 翻译:"after some reading,blink your eyes for a few seconds.close them tightly.
• 翻译:"after some reading,blink your eyes for a few seconds.close them tightly.
• people who do not get enough vitaminPeople who do not get enough vitamin A in their diet may develop night blindness.But in the developing world a lack (缺乏) of vitamin A causes much more serious harm to children.According to the WHO,as many as 25,000 children die every year because of a lack of vitamin A.One excellent source of vitamin A is found in sweet potatoes with orange flesh (采肉).Orange sweet potatoes contain high levels of beta-carotene (β胡萝素)
• 英语作文how to overcome the pressure of exams内容：平时努力学习 考前适当运动 睡前洗热水澡喝热牛奶 要求；100词初三水平的就可以了!