[单项选择]以下操作能正确为已编辑的Word文档设置密码保护的是( )。
A. 工具→保护文档
B. 在“另存为”对话框下选择“工具”菜单，然后选择“安全措施”选项
C. 按住Shift键不放，然后单击“保存”按钮
D. 依次打开工具→选项→保存，设置“保存”选项

{{B}}How Ice Cream Works{{/B}}
The U.S. ice cream industry sells about a million gallons of ice cream each year, dispensing cones, gallons, pints, sundaes and other desserts through grocery stores and ice cream shops, In fact, eight percent of all the milk produced in the U.S. ends up in a frozen dairy product.
{{B}}Ice Cream or Frozen Dessert {{/B}}
Not just any frozen treat can be called ice cream. In fact, the U.S. Department of Agriculture has specific rules that define what can and can’t be labeled "ice cream". To bear the "Meets USDA Ingredient Standard for Ice Cream" stamp, it has to contain at least 10 percent milk fat, and a minimum of six percent non-fat milk solids. A gallon has to weigh at least 4.5 pounds.
The range of milk fat (sometimes referred to as butter fat) used in ice cream can go from the minimum 10 percent to a maximum of about 16 percent. Most premium ice creams us