题目

Many Web sites collect personal information. Some Web sites ask for personal information before granting (许可) access. You may be asked for your full name, age, address and telephone number. Other Web sites collect information in more ways such as making a record of your Internet Protocol (IP) address and of the Web pages you visit. Web sites do this by placing one or more “cookies” on the hard drive of the computer you are using. “Cookies” are small files of text that can collect and store information such as: ● the Internet Protocol (IP) address of your computer; ● how为了除去粗盐中的Ca2+、Mg2+、SO42-及泥沙，可将粗盐溶于水，然后进行下列五项操作：①过滤，②加过量NaOH溶液，③加适量盐酸，④加过量Na2CO3溶液，⑤加过量BaCl2溶液．正确的操作顺序是（　　）A．①④②⑤③B．④①②⑤③C．②⑤④①③D．⑤②④①③