题目内容
甲、乙两公司拟签订一项货物买卖合同，甲为卖方，乙为买方，标的物为A种货物。在签订合同时甲要求丙公司为乙付款提供保证，当乙不能付款时，由丙连带承担偿付货款的责任。考虑到乙经营情况良好，丙同意提供保证并与甲签订了书面保证合同。甲、乙两公司的货物买卖合同签订后，甲以不能全部提供合同标的物为由，与乙协商将标的物改为B种货物。甲、乙双方达成改变合同标的物协议，未经丙同意。甲在约定的供货时间内仍然不能提供全部B种货物。甲未经乙同意，与丁公司达成协议，不足部分的B种货物由丁向乙提供。甲、丁向乙提供了全部货物，但超过了甲、乙约定的供货期限。乙虽接受了货物，但以甲、丁未按期履行供货义务为由，行使先履行抗辩权，拒绝履行付款义务。甲遂诉至人民法院，请求判令丙偿还货款。请回答下列问题： 甲、丁两公司达成的提供货物协议是否有效？（ ）
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It had been a tiring day and I was looking forward to a quiet evening. My husband would not be back until (41) and I had decided to settle down in a comfortable chair in the living room and read a good book. I (42) the children to bed early and (43) a sandwich and a cup of coffee. Soon I was (44) comfortably with my book in front of me and the sandwich and cup of coffee (45) a tray beside me.I was just beginning to eat (46) the telephone rang. I dropped my book and hurried to answer it. (47) the time I got back to the living room, my coffee was cold. I ate the sandwich and began sipping(呷) (48) coffee with the book still open (49) the first page. Suddenly there was a loud knock (50) the front door. It startled me so (51) that I (52) some coffee on my skirt. The man (53) the door was looking for a (54) address and wanted me to give him directions. It took me a long time (55) him. After that, I sat down again and (56) to read a whole page without further interruption until the baby woke up. He started screaming at the top of his (57) , so I rushed upstairs. He was still (58) at 11 o’clock when my husband came home, I (59) something at him when he asked me (60) I had spent a pleasant evening. 52（）
It had been a tiring day and I was looking forward to a quiet evening. My husband would not be back until (41) and I had decided to settle down in a comfortable chair in the living room and read a good book. I (42) the children to bed early and (43) a sandwich and a cup of coffee. Soon I was (44) comfortably with my book in front of me and the sandwich and cup of coffee (45) a tray beside me.I was just beginning to eat (46) the telephone rang. I dropped my book and hurried to answer it. (47) the time I got back to the living room, my coffee was cold. I ate the sandwich and began sipping(呷) (48) coffee with the book still open (49) the first page. Suddenly there was a loud knock (50) the front door. It startled me so (51) that I (52) some coffee on my skirt. The man (53) the door was looking for a (54) address and wanted me to give him directions. It took me a long time (55) him. After that, I sat down again and (56) to read a whole page without further interruption until the baby woke up. He started screaming at the top of his (57) , so I rushed upstairs. He was still (58) at 11 o’clock when my husband came home, I (59) something at him when he asked me (60) I had spent a pleasant evening. 44（）
Thousands of gypsies have been trying to emigrate to Canada and Britain. They say they are fleeing persecution(迫害), but most have found they are not welcome in these countries either. Gypsies have never had a home.Europe has experienced enormous upheavals this century. Wars, revolutions, separations and elections have changed the political map of the continent countless times. And with each change, power has shifted, creating new winners and new losers.But for one group -- the gypsies -- change has always meant losing. With each upheaval, the gypsies have been left worse off than they were before. Yet they have survived to become Europe’s largest minority. Moreover, they have succeeded in preserving their culture and their way of life in the face of genocide (种族灭绝), political persecution and poverty.In other cases where minorities have survived similar persecutions -- like Jews during World War Ⅱ, or blacks in South Africa -- their cause has received international support. By contrast, the gypsies’ success at preserving their culture is not regarded as an achievement at all. Instead, it’ s viewed as proof they are both unwilling and unable to change, and therefore irredeemable (不可救药的). Indeed, in 1993, the president of the Slovak Republic attacked their way of life and said steps should be taken to limit the extension of this socially unacceptable and mentally backward population.If such a thing had been said about any other minority, the political protest would have been enormous But, bemuse the Slovak President was referring to gypsies, there were few complaints, except from a few small organizations who try to protect gypsies’ rights. It can be inferred from the passage that the survival of gypsies’ culture （）.
It had been a tiring day and I was looking forward to a quiet evening. My husband would not be back until (41) and I had decided to settle down in a comfortable chair in the living room and read a good book. I (42) the children to bed early and (43) a sandwich and a cup of coffee. Soon I was (44) comfortably with my book in front of me and the sandwich and cup of coffee (45) a tray beside me.I was just beginning to eat (46) the telephone rang. I dropped my book and hurried to answer it. (47) the time I got back to the living room, my coffee was cold. I ate the sandwich and began sipping(呷) (48) coffee with the book still open (49) the first page. Suddenly there was a loud knock (50) the front door. It startled me so (51) that I (52) some coffee on my skirt. The man (53) the door was looking for a (54) address and wanted me to give him directions. It took me a long time (55) him. After that, I sat down again and (56) to read a whole page without further interruption until the baby woke up. He started screaming at the top of his (57) , so I rushed upstairs. He was still (58) at 11 o’clock when my husband came home, I (59) something at him when he asked me (60) I had spent a pleasant evening. 59（）
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