单选题:One can make a password safer by ________.

题目内容:
One can make a password safer by ________. A.inserting pictures between numbers
B.avoiding the use of letters altogether
C.setting up a firewall against computer hackers
D.using complicated combinations of numbers and letters
参考答案:
答案解析:

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By 2050 the world will have about 2 billion people aged over

By 2050 the world will have about 2 billion people aged over 60, three times ___

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定喘汤的药物组成中含有

定喘汤的药物组成中含有A.麻黄、杏仁 B.当归、半夏 C.苏子、桔梗 D.黄芩、陈皮 E.桑白皮、地骨皮

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