单项选择题

Email is the______of much organized exchange between groups of individuals．

A．basis
B．foundation
C．very
D．way
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单项选择题
E-checks require digital______and authentication services to digitally process information between the payer payee,and bank．
A．signatures
B．message
C．document
D．encrypt
单项选择题
The suffixes com,org,edu,mil,and gov appearing in E-mail addresses stand for______,organization,educational,military,and governmental respectively．
A．commercial
B．company
C．communication
D．communicant
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