假定你是李华，你的朋友David 来信寻求你的建议：在全国人民的团结努力下，如今新冠疫情已有所好转，他出门是否可以不戴口罩。请你给他回一封信。内容要点如下：1.说明写信目的2.提出建议并说明理由注意：1.词数100左右；2.可适当增加细节，以使行文连贯。参考词汇：新冠疫情COVID-19；口罩mask 答案：【答案】Dear David , Having learned that COVID-19 is under control with the help of the united efforts of the whole nation , I am really delighted for you. You asked me if you can go out without wearing a mask.Here I am writing to offer you some suggestions, which I hope will be of some help to you. To begin with, it is necessary that you stay at home and reduce outdoor activities as much as p