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简述在国际证券流通市场中场外交易与场内交易的主要区别。

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B 根据下面短文回答下列问题。 Tom was seven years old. He went to a school near his house. He could go there and come home by bus or by school-bus every day, but he always went to school and came home on foot. He usually got back on time, but last Friday he came home late from school. When he ran into the house, his mother was in the sitting room. When she saw him, she said, "Why are you late today, Tom" "My teacher was angry and sent me to the headmaster after school." Tom answered. "To the headmaster" his mother said in surprise. "Why did she send you to him" "Because she asked a question in class," Tom said, "and none of the children gave her the answer except me." Her mother was angry. "But why did the teacher send you to the headmaster then Why didn’t she send all the other children she asked Tom." "Because her question was who put the glue (胶水) on her chair.\ No one else in the class placed glue on the teacher’s chair.

A. [A] True
B. False

设供应商零件的关系模式为SP(Sno，Pno，Qty)，其中Sno表示供应商号，Pno表示零件号，Qty表示零件数量。查询至少包含了供应商“168”所供应的全部零件的供应商号的SQL语句： (4) FROM SP SPX WHERE (5) (SELECT* FROM SP SPY WHERE (6) AND NOT EXISTS (SELECT* FROM SP SPZ WHERE (7) ))

设有某简化的网上购物系统，其E-R图如下：该系统数据之间存在下列约束： Ⅰ．一个客户(编号唯一)可以拥有多个订单，每个订单仅属于一个客户。 Ⅱ．一个订单(编号唯一)可以包含多个订购细目，每个订购细目只属于一个订单。 Ⅲ．一种商品可以出现在多个订购细目中，一个订购细目只包含一种商品。 Ⅳ．一个商品类别可以包含多种商品，一种商品只属于一个商品类别。给出该数据库符合3NF要求的全部关系模式，并指出关系模式中的全部主码和外码。

C 根据下面短文回答下列问题。 Peter has been worried all the week. He got a letter from the police (警方). They told him to go to the police station (警察局) as soon as he got the letter. Peter wondered (不知道) why the police wanted him. He went to the police station yesterday, and now he is not worried any more. At the station a smiling policeman told him that they had found his bike five days ago. The policeman said, they found his bike in a small village four hundred miles (英里) away. Now they were sending it to his home by train. Peter was very much surprised when he heard the news. He never thought he could have found the bike. He lost it twenty years ago when he was a boy of fifteen. Peter was happy when he got a letter from the police.

A. [A] True
B. False