单项选择题

Which commercial usage of the Internet does the author NOT refer to

A．Buying airline tickets.
B．Trading stocks.
C．Paying bills.
D．Opening a bank account.
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单项选择题
What is this text mainly about
A．Conveniences brought to consumers through use of the Internet.
B．Implications of increasing commercial use of the Internet.
C．Security risks posed by commercial use of the Internet.
D．Advantages of Internet banking versus traditional banking.
单项选择题
What is the author's attitude towards people's superstitious beliefs
A．He is mildly critical.
B．He is strongly critical.
C．He is in favour of them.
D．His attitude is not clear.
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