【单选题】【消耗次数:1】
Computer classes must be __________ to every student of all grades, which will make them have a good command of the modern communication and learning tool.
accessible
avoidable
valuable
acceptable
参考答案:
复制
纠错
相关题目
【单选题】 According to the author, in order to have a good command of English one must ____.
①  employ as many learning strategies as possible
②  expect to gain an easier task
③  exert oneself constantly
④  sustain oneself
【单选题】 The English teacher strongly advises that every student ____ an all English dictionary.
①  to buy
②  buying
③  in buying
④  buy
【单选题】 I’m thinking of buying a computer. Can you ( ) a good make to me?
①  advise
②  recommend
③  propose
④  suggest
【单选题】 By _________ learning possible anytime and anywhere, distance education is a powerful tool for supporting lifelong learning.
①  making
②  make
③  made
④  be made
【单选题】 Which three groups can summarize all the elements of the qualities of a good teacher?
①  Ethic devotion, professional qualities and personal styles
②  Ethic devotion, professional qualities and individual freedom
③  Individual freedom, professional qualities and personal styles
④  Ethic devotion, personal styles and individual freedom.
【单选题】 By making learning possible anytime and anywhere, distance education is a powerful tool _________ supporting lifelong learning.
①  to
②  for
③  with
④  on
【单选题】 The elbows on your coat have worn thin, so I must _____them.
①  mend
②  patch
③  repair
④  pitch
【单选题】 We must ( ) that all patients have access to high quality care.
①  ensure
②  award
③  grant
④  challenge
【单选题】 As a freshman, we should get to know campus ( ) as soon as possible and make good use of them.
①  Source
②  sources
③  resource
④  resources
【判断题】 In precis writing, you need to make a list of all the important points and group them under diffferent items.
①  正确
②  错误
随机题目
【单选题】 后备副本的作用是( )。
①  一致性控制
②  数据的转储
③  保障安全性
④  故障后的恢复
【判断题】 使用检查点可以改善数据库恢复的效率。
①  正确
②  错误
【判断题】 基于静态转储的数据库对出现介质故障的数据库系统进行数据恢复时,必须根据日志UNDO所有未完成的事务。
①  正确
②  错误
【判断题】 很多故障都可能破坏数据库的一致性。
①  正确
②  错误
【判断题】 在集中式数据库中,查询执行的主要开销是CPU和内存中的运算时间。
①  正确
②  错误
【判断题】 建立索引需要额外的存储代价,但使用索引扫描一定比简单的全表扫面效率要高。
①  正确
②  错误
【判断题】 事务T在修改数据R之前必须首先对其加X锁,知道事务结束才释放,这是二级封锁协议的规则。
①  正确
②  错误
【判断题】 封锁对象的大小称为封锁的粒度。在关系数据库中,封锁对象可以是一些逻辑单元,也可以是一些物理单元。
①  正确
②  错误
【判断题】 调度r1(A); r2(A); r3(B); w1(A); r2(C); r2(B); w2(B); w1(C);是冲突可串行化的。
①  正确
②  错误
【判断题】 如果事务T1需要两次读取同一数据项A,但是在两次读操作的间隔中,另一个事务T2改变了A的值,那么此并发操作所引起的问题是读“脏”数据。
①  正确
②  错误