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【单选题】
既是信息安全技术的核心，又是电子商务的基础技术的是（）A.
PKI
B.
SET
C.
SSL
D.
ECC
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反馈参考答案：
举一反三
【判断题】When taking an international flight, you’d better arrive at the airport terminal two hours before departure.
A.
正确
B.
错误
【单选题】If you are invited to a person’s home for a social occasion, you’d better arrive ______.
A.
at the exact time specified
B.
earlier than the specified time
C.
several minutes later than the specified time
D.
half an hour later than the specified time
【判断题】For an international flight, you’d better arrive at the airport at least 30 minutes early.
A.
正确
B.
错误
【判断题】You’d better arrive ten minutes earlier when you are invited to have dinner at your French friend’s house.
A.
正确
B.
错误
【判断题】You’d better arrive to the room in which you will be speaking early to make sure everything is functional for your speech.
A.
正确
B.
错误
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