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16.根据支付系统无安全措施的模型填写图5-7。 (1) ( )
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输入/输出端口有两种编址方法，即I/O端口与存储器单元统一编址和I/O端口单独编址。前一种编址的主要优点是 【20】 ，后一种编址的主要优点是专用I/O指令字节数少，指令执行快和不占用存储空间。
(每题的备选项中，有2个或2个以上符合题意，至少有1个错项。) 甲将被单位外派出国两年，临行前将自己的一套房屋钥匙交与邻居乙，让乙帮其照看房屋。甲走后不久，乙以房主身份将甲的房屋出租给丙，与丙签定房屋租赁合同，合同期一年半。甲的单位因有其他安排提前一年将甲从国外调回，甲回到家看到自己的房屋有人住，丙还拿出当初与乙签的合同给甲看，甲看后便明白是怎么回事。 担保物权包括( )。
某硬木地板工程中，已知地板工程量为150m2，使用15mm×100mm×3000mm的木板条，损耗率为5%，则需要多少根木板条
46) The teaching of English as a second language (ESL) in schools has had a history of conflicting arguments, interesting innovations and some very positive methodological changes. To understand the present situation, it is necessary to consider the past and the wider educational context which has a bearing on it.Until quite recently, approaches to ESL work have been strongly influenced by methods developed to teach English as a foreign language to older learners. These methods placed much emphasis on drills, exercises and remedial programs that focus on language in abstraction. 47) The prescriptive nature of such methods and the demands they made on the teacher’s time developed the belief that ESL work would be tackled only by the specialist ESL teacher working with small groups of children. 48) Such an approach does not fit comfortably into current notions of learning and teaching in the primary school, nor does it sufficientlv equip ESL learners in the secondary school to benefit from normal schooling. In prescribing what language is to be taught, it has ignored what children bring to the learning task and the choices they make about how and what they want to learn. Furthermore, the location and organization of language provision did not measure up to the demand. 49) The language centers and English language services all contributed to providing special and concentrated teaching of English as a second language in small groups, varying in size from four or five to fifteen, Whatever the pattern of provision, the main aim was to give pupils sufficient English to enable them to join normal schools as quickly as possible. The success of such special provision depended very much on the close and constant liaison of language teachers with the subject teachers and the class teachers and on the continuity of learning experiences provided by them. One of the important disadvantages of language centers and withdrawal groups was that ESL children were being taught away from those English-speakers who provide the most powerful models, i.e. their peer (地位相同的) group.Peer group interaction is an important element in any learning situation, but its particular strengths in a classroom with ESL learners cannot be over-emphasized.50) The separation of second-language learners from the main-stream classroom cannot easily be justified on educational grounds, since in practice it leads to both their curriculum and language learning being impoverished. The teaching of English as a second language (ESL) in schools has had a history of conflicting arguments, interesting innovations and some very positive methodological changes.
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