【单选题】【消耗次数:1】
Its ( ) that he has been away from home.
evident
important
genuine
alternative
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相关题目
【单选题】 He has been there, [填空]?
①  hasnt he
②  has he
③  does he
④  doesnt he
【单选题】 The garden ____ while the Greens were away from home.
①  took good care of
②  was taken good care
③  was taken good care of
④  was taking good care
【单选题】 The garden _______while the Greens were away from home.
①  took good care of
②  was taken good care
③  was taken good care of
④  was taking good care
【单选题】 Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒).Why did the country mentioned in the passage suffer from floods and starvations?
①  Because it set up an empire.
②  Because it fell to pieces.
③  Because it turned its trees into warships.
④  Because it spent too much money on wars.
【单选题】 This job is great ( ) advancement, but its too far away from my hometown.
①  in terms of
②  as a result of
③  based on
④  on behalf of
【判断题】 He has been in china for three years.
①  正确
②  错误
【单选题】 Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒).According to the passage, which is the most important service of trees to man?
①  They help him make money.
②  They give him cool.
③  They give him wood and other things.
④  They help him to stop droughts and floods.
【单选题】 Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒).In many places forests slowly disappear because __________.
①  many trees have been cut down by man
②  new trees are not well looked after
③  man has not paid enough attention to planting trees
④  all the above
【单选题】 He has been to Beijing . So [填空] I.
①  have
②  does
③  do
④  did
【单选题】 he park has been built and it will be open _____ three years
①  A. in
②  B.for
③  C.on
④  D.after
随机题目
【简答题】 在关系数据库的规范化理论中,通过[填空]将低级范式转化为高级范式。
【简答题】 实体之间的联系可抽象为三类,它们是1对1、[填空]和多对多。
【简答题】 在关系数据库规范化理论的研究中,在函数依赖的范畴内,[填空]范式达到了最高的规范化程度。
【简答题】 若事务在运行过程中,由于种种原因,使事务未运行到正常终止点之间就被撤消,这种情况就称为[填空]。
【简答题】 关系的五种基本运算是并、差、[填空]、选择和投影。
【简答题】 一般情况下,当对关系R和S使用自然连接时,要求R和S含有一个或多个共有的[填空]。
【简答题】 用于实现授权管理的SQL语句是:[填空]和Revoke。
【判断题】 数据独立性指数据的存储与应用程序无关,数据存储结构的改变不影响应用程序的正常运行。
①  正确
②  错误
【多选题】 数据库运行过程中死锁预防的方法有________
①  一次封锁法
②  顺序封锁发
③  超时法
④  等待图法
【多选题】 以下属于并发操作带来的问题的是?
①  丢失修改
②  读脏数据
③  不可重复读
④  死锁