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以下关于算法“DES”说法错误的是：（ ）
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在公钥密码体系中，加密和解密是使用（ ）的密钥。
用于开放网络进行信用卡电子支付的安全协议是（ ）。
对话填空：（选择恰当的句子或表达法填空，只填序号。）Dialogue 1M: To tell the truth, it's impossible for us to1based on your offer. There iscompetition from America. They could give us offers about 10% lower than yours.W: Taking everything into consideration,2.M: Only because we have cooperated for a long time, we place the order for rice with you.W：To be honest, we3at this price.M: We only hope that your price is comparable to others'. It's reasonable, isn't it?W: Alright, we can cut our price by 3% in order tobe in line with your market. It's absolutely4.M: OK.5.A. our offer is reasonableB.our bottom lineC.close the dealD. Let's call it a deal.E. make little profit
Dialogue 2M: We're interested in your pure silk shirts.W: This is our newest style for this year.M:1If it proves to be satisfactory in our market, we'll order more.W: I'm sorry,2is 800 pieces at US$ 15.M: Oh, dear, this style is new to our customers. 800 pieces will be too many for us.3?W：500 pieces with a slight increase in price is the best I can do. One dollar more than the presentprice. OK?M: Well，4on the condition that you will deliver the goods right away.W: OK.5.A. Could you reduce your minimum to 500 piecesB. I'd like to order 300 pieces first for a trial order.C.I could accept your offerD. The minimum order for this styleE. You can count on it.
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