题目内容：

假如你是李华，你的好友李娜要邀你一起去西藏旅行，但你得陪同父母去看望在乡下的爷爷奶奶，所以不能去。请以电子邮件的形式给你的朋友提一下旅行建议。1.加入旅行社，同时结伴而行；2.早晚气温较低，带上轻薄的棉衣; 3.日照时间长，带上太阳镜，遮阳帽等物品；4.空气稀薄，戴上吸氧用具。(西藏Tibet   旅行社 travel agency   吸氧用具 Oxygen inhalation apparatus)

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