A 100-pound child should carry a backpack of more than 20 pounds.
A. Right
B. Wrong
C. Not mentioned
查看答案
清醒病人，非腐蚀性药物中毒时可先用棉签或压舌板刺激咽喉壁催吐。()
Backpacks with wide， padded straps and a belt can help to avoid problems of sprains and strains. 查看材料
A. Right
B. Wrong
C. Not mentioned
Children should put all the books in their locker. 查看材料
A. Right
B. Wrong
C. Not mentioned
Roller bags tend to be heavier than ordinary backpacks.
A. Right
B. Wrong
C. Not mentioned
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