单项选择题

When an e-mail phone is being used to make phone calls, it ______.

A．cannot receive new messages
B．send out a signal of new messages
C．cannot display e-mail messages
D．automatically checks new messages
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单项选择题
One fundamental flaw of e-mail phones is that people cannot use it to ______.
A．receive or send e-mails with attached files
B．receive attached files with documents
C．read attached files with graphics
D．read only messages in the form of simple text
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