题干

人没有付出的话就什么都得不到,为了得到某样东西,就需要付出同等的代价,这就是等价交换原则。在商品经济条件下,等价交换是价值规律的基础。下列有关等价交换说法正确的是(  )
①每一次具体的交换过程都是等价的 
②价格围绕价值上下波动 
③在商品交换过程中绝大多数场合是等价交换,少数场合是不等价的 
④交换的平均场合是等价的

A:①②

B:②④

C:②③

D:③④

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答案(点此获取答案解析)

B

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    Arriving in Sydney on his own from India, my husband, Rashid, stayed in a hotel for a short time while looking for a house for me and our children.

    During the first week of his stay, he went out one day to do some shopping. He came back in the late afternoon to discover that his suitcase was gone. He was extremely worried as the suitcase had all his important papers, including his passport(护照).

    He reported the case to the police and then sat there, lost and lonely in strange city, thinking of the terrible troubles of getting all the paperwork organized again from a distant country while trying to settle down in a new one.

    Late in the evening, the phone rang. It was a stranger. He was trying to pronounce my husband's name and was asking him a lot of questions. Then he said they had found a pile of papers in their trash can(垃圾桶) that had been left out on the footpath.

    My husband rushed to their home to find a kind family holding all his papers and documents(文件). Their young daughter had gone to the trash can and found a pile of unfamiliar papers. Her parents had carefully sorted them out, although they had found mainly foreign addresses on most of the documents. At last they had seen a half-written letter in the pile in which my husband had given his new telephone number to a friend.

    That family not only restored the important documents to us that day but also restored our faith and trust in people. We still remember their kindness and often send a warm wish their way.