to prevent H7N9 we should know some common sense. First of all, it is important for us to prevent H7N9 from ourselves. For example, clean our hands frequently.
Sencondly, do more exercises. Such as running. Lastly, change our diet to keep balence. For example, eat more types of vegetables and drink more water
包括地址,电话号码,电子函件号码,电传号码,电报号码等以及发信日期.位置在信纸的右上角,可以从靠近信纸的中央写起.先写发信人地址,后写日期.地址按由小到大的规则.日期即可月,日,年,又可日,月,年.
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