The balances on their operating statements can not be called profits or losses, rather they are called surpluses or ______.

单项选择题Some companies are limiting the risk by conducting online ______ only with established business partners who are given access to the company's private intranet.

单项选择题It is important that employees stick to their company's security policies because ______.

单项选择题The word underscore in the last sentence of the text probably means ______ .

单项选择题The 2003 survey reveals that ______.

单项选择题Which of the following elements is the most critical to online security according to the author

单项选择题Which of the following statements does the author imply

单项选择题An operating system is no guarantee of online security probably because ______.

单项选择题The best title for the passage would be ______.

单项选择题To define science we may simply call it ______.

单项选择题Pure science, leading to the construction of a microscope, ______.