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【单选题】
电子商务产生和发展的主要条件是A.
计算机的广泛应用，网络的成熟
B.
信用卡的普及应用，安全电子交易协议的制定
C.
政府的支持与推动
D.
以上都是
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皮皮学刷刷变学霸
举一反三
【单选题】关于反馈作用的叙述,错误的是
A.
负反馈能使某种生理功能保持相对稳定
B.
各种调节方式均有反馈作用
C.
正反馈在机体功能调节中为数较多
D.
是保证调节精确性的重要机制
E.
正反馈能使某种生理功能迅速完成
【单选题】Wal-Mart is now trading at a much lower price because______.
A.
it has stored a large quantity of goods
B.
it has become financially more powerful
C.
it has been eager to collect money to prevent bankruptcy
D.
it is a good way to compete with other retailing companies
【简答题】It was ____ (thought) of you to bring flowers.
【单选题】The term tariff, as used in international trade, refers to______.
A.
the limit on the quantity of a good that can be imported into a country
B.
the price of goods when they leave the producing country
C.
the government payment to encourage exports
D.
the tax on imports
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