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【单选题】
VISA与Master Card在IBM等技术公司的帮助下联合开发了( )安全电子交易协议。 A SET
A.
CET
B.
SAT
C.
CAT
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【简答题】Everyone talks about the greenhouse effect(温室效应) and how our Earth and its climate are being affected. We can do a science experiment designed by some kids to show this effect and what is happening to...
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