According to the passage, efficiency of e-
题型:单项选择题
问题:
According to the passage, efficiency of e-mail is threatened by ______
A.heavy e-mail traffic
B.fraudulent e-mail messages
C.large volume of messages
D.increasing amount of unwanted e-mail
According to the passage, efficiency of e-mail is threatened by ______
A.heavy e-mail traffic
B.fraudulent e-mail messages
C.large volume of messages
D.increasing amount of unwanted e-mail