//一次展示且只展示三个商品，并且为他们标定价格
static public string Show()
{
if (Game.IntRecord.Get("上次访问商店时间") != DateTime.Now.DayOfYear)
{
Game.IntRecord.Set("上次访问商店时间", DateTime.Now.DayOfYear);
PriceLow();
}
while (Items.Dic.Count < 3)
{
var item = ItemList.ChooseOne();
//已经包括的，不加入
if (Items.Contain(item.name))
{
continue;
}
Items.Set(item.name, (new Random()).Next(item.priceLow, item.priceHigh + 1));
}
string temple = "能买道具的时候要尽量购买！";
int times = 1;
foreach (var c in Items.Dic)
{
temple += $"\n{times}/ {c.Key}, 价格：{c.Value}";
times++;
}
return(temple);
}