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公钥密码体制有两种基本的模型：一种是加密模型、另一种是 【4】 。
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（二）资料 32岁的刘某2001年8月与广州一家公司签订了一份为期10年的劳动合同，合同中所定的工资低于广州市最低的工资标准，但因公司急需用人，老板强迫刘某在合同上签了字，合同中规定试用期为9个月，但没有规定劳动保护和劳动条件，2001年12月份，刘某因工受伤，公司遂解雇了刘某，刘某不服。 根据以上材料完成下列问题。 这份合同是一份无效合同，因为( )。
美达家具厂得知Z机关所建办公楼要购置一批办公桌椅，便于2009年2月1日致函Z机关以每套1000元的优惠价格出售办公桌椅。Z机关考虑到美达家具厂生产的家具质量可靠，便于2月2日回函订购300套桌椅，提出每套价格800元，同时要求3个月内将桌椅送至z机关，验货后七日内电汇付款。美达家具厂收到函件后，于2月4日又发函z机关，同意z机关提出的订货数量、交货时间及方式、付款时间及方式，但同时提出其每套桌椅售价1000元已属优惠价格，考虑z机关所订桌椅数量较多，可以按每套桌椅900元出售。Z机关2月6日发函表示同意。2月7日，美达家具厂电话告知Z机关收到2月6日函件。该合同的要约为( )。
Questions 28 and 29 are based on the following news. At the end of the news item, you will be given I0 seconds to answer the questions. Now, listen to the news. The journalist was brought to court because______.
In November, 1969, I was working for the federal government in Champaign, where I was a security guard at their Nike Hercules Missile Base. The base, located on Lake Shore Drive near Chicago, was surrounded by water and rock-filled banks. It was my job to check all the guard points, making sure the base was secure. When I arrived late one afternoon at the security office for my shift, I noticed a warning posted on the boards: large parts of the fencing on the west side of the lake had been cut and not yet repaired. I immediately called my supervisor Colonel Stabler in Champaign to report the problem. In response, Colonel Stabler told me to act as a sentinel relief man and double-check all stations. As each guard reported in, I would re-walk the area to see if the guard had missed anything. As night came on, there was a misty rain, and the fog from the lake began forming a heavy cloud around the area, limiting vision to a few feet. At 11:45 p. m. , one of the guards reported another section of the fence cut on the west side of the base. I immediately fastened on my pistol and headed for the area. When I arrived, a ghostly object startled me, moving along the shoreline. Then a loud splash sounded in the water. In a virtual panic, I locked and loaded my weapon. In the next instant, a white figure suddenly loomed up from the lake shore. "A ghost!" I thought. I was so upset and scared, I couldn’t scream, and my gun slipped from my lifeless finger. As I stood frozen in my tracks, the phantom moved steadily closer, signaling for me to approach. When it approached within a few feet, I bolted, fleeing the area as fast as I can run. When I got back to the security post, I dialed the lake patrol with shaking hands, demanding that they search the sea. Shortly afterward, they captured an escaped mental patient who admitted walking through the area. Under questioning, the man claimed he was a ghost from the past. In this escape, he had fitted a large bed sheet over his body, cutting crude holes for his eyes and mouth. Still a bit shaky, I called the mental institution to confirm the man’s escape, and directed the security team to escort him back. When I reported the incident to Colonel Stabler the next day, he said, "Larry, there’s a show on tonight you should go and see. " I said, "What show" He said, laughing, "Casper, the friendly ghost. " From that day onward, whenever the colonel called, he would ask, "Is Casper the friendly ghost busy\ The narrator ______ when he saw the white figure motioning him to approach.
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