【单选题】【消耗次数：1】
After a week at sea, the sailors saw ______.
①
land
②
earth
③
ground
④
soil
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相关题目
【单选题】
Just as the soil is a part of the earth, ____ the
atmosphere.
①
as it is
②
so is
③
the same as
④
and so is
【单选题】
Train services are now back to ____after last week’s strike.?
①
ordinary ?
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usual ?
③
normal ?
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natural?
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After so many weeks without rain, the ground quickly _____the little rain that fell last night.
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skipped
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soaked
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retrieved
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absorbed
【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)．Land becomes desert after all trees are cut down because __________.
①
roots of trees break up the soil
②
no tree keeps the rain and protects the top-soil
③
strong winds bring a lot of sand
④
there are too many rainfalls to make it
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案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)．3. Land becomes desert after all trees are cut down because __________.
①
A. roots of trees break up the soil
②
B. no tree keeps the rain and protects the top-soil
③
C. strong winds bring a lot of sand
④
D. there are too many rainfalls to make it
【单选题】
The rain was heavy and ____ the land was flooded.
①
consequently
②
continuously
③
constantly
④
consistently
随机题目
【单选题】
下列关于整机系统的说法哪一个不正确（ ）。
①
现代计算机器中，可以将弗洛伊曼型计算机的五大部件集中于一块芯片制造出来
②
整机系统中必须带操作系统
③
现代计算机中扩展的板卡如显卡、声卡、网卡等也可以当作一个小型专用的整机系统看待
④
理解一个整机系统，从其五大部件去分析是一个很好的切入点
【单选题】
下列对电子数字式计算机工作电路的说法哪一个是不正确的（ ）。
①
数字式电路中信息载体往往采用的是电的某一方面的属性，比如电平高低范围
②
数字式电路中的开关元件不具备信息存储功能，所以往往要将电信号转换为其它比如磁信号进行信息存储
③
数字式电路采用的开关元件的电平范围往往需要遵照一定的行业标准
④
一般来说，数字式电路采用的电平范围越大越有利于抗干扰