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【单选题】
It was not until the accident happened ______.
A.
when I realized my carelessness
B.
that I realized my carelessness
C.
as I realized my carelessness
D.
when my carelessness has been realized
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【单选题】加拿大研究人员对北美不同地区平均年龄29.4岁的308位志愿者(其中198位是女性)进行了调查，结果发现50.7％的人有互联网拖延症，而且上网时间的47%不是用来工作，而是用来拖延工作。研究表明：白领的拖延情况比蓝领更严重；被雇佣的白领比自由经营的白领更严重；雇佣情况下，下级比上级拖延情况更严重。如果人们对成功的确定性大或者容易转移注意力，就更容易拖延。而令人愉悦的工作、更直接的回报、更大的机会，...
A.
较少的体力付出
B.
丰厚的薪酬待遇
C.
有趣的工作内容
D.
明确的人生目标
【单选题】According to the passage, random failures in automatic control systems are 'not merely trivial aberrations' because ______.
A.
automatic control systems are designed by engineers who have little practical experience in the field
B.
the failures are characteristic of systems designed by engineers relying too heavily on concepts in mathematics
C.
designers of automatic control systems have too little training in the analysis of mechanical difficulties
D.
designers of automatic control systems need more help from scientists who have a better understanding of the analytical problems to be solved before such systems can work efficiently
【单选题】What is new about this year's meeting?
A.
The cost for registration is low.
B.
It offers money to some groups.
C.
Individual students are welcome.
D.
There is wireless Internet service.
【单选题】'The old verities' labeled by William Faulkner (Line 2, Paragraph 4) must refer to ______.
A.
the past ways for ruling a society
B.
the society's established virtues
C.
the traditional doctrines and justice
D.
the out-of-date moral conducts
【单选题】如果保证合同对保证期间未约定或约定不明，则自主债务履行届满之日起 ( )，债权人未要求保证人承担保证责任，保证人免除保证责任。
A.
6个月内
B.
1年内
C.
2年内
D.
3年内
【单选题】According to the passage, all of the following are true concerning the process of negative feedback EXCEPT
A.
By diminishing errors, negative feedback allows systems to correct themselves.
B.
Negative feedback always arises out of a system where several factors are interacting.
C.
Negative feedback sometimes causes a disturbed system to over-correct, resulting in an impressed change opposite to the original disturbance.
D.
Negative feedback is less important, on the whole, than departure from equilibrium.
E.
Ideally, negative feedback gradually diminishes, allowing a system to find its desired course.
【单选题】Crippen was absent from the DNB ______.
A.
because he escaped to the U.S.
B.
because death sentence had been abolished
C.
for reasons not clarified
D.
because of the editors' mistake
相关题目：
【单选题】加拿大研究人员对北美不同地区平均年龄29.4岁的308位志愿者(其中198位是女性)进行了调查，结果发现50.7％的人有互联网拖延症，而且上网时间的47%不是用来工作，而是用来拖延工作。研究表明：白领的拖延情况比蓝领更严重；被雇佣的白领比自由经营的白领更严重；雇佣情况下，下级比上级拖延情况更严重。如果人们对成功的确定性大或者容易转移注意力，就更容易拖延。而令人愉悦的工作、更直接的回报、更大的机会，...
A.
较少的体力付出
B.
丰厚的薪酬待遇
C.
有趣的工作内容
D.
明确的人生目标
【单选题】According to the passage, random failures in automatic control systems are 'not merely trivial aberrations' because ______.
A.
automatic control systems are designed by engineers who have little practical experience in the field
B.
the failures are characteristic of systems designed by engineers relying too heavily on concepts in mathematics
C.
designers of automatic control systems have too little training in the analysis of mechanical difficulties
D.
designers of automatic control systems need more help from scientists who have a better understanding of the analytical problems to be solved before such systems can work efficiently
【单选题】What is new about this year's meeting?
A.
The cost for registration is low.
B.
It offers money to some groups.
C.
Individual students are welcome.
D.
There is wireless Internet service.
【单选题】'The old verities' labeled by William Faulkner (Line 2, Paragraph 4) must refer to ______.
A.
the past ways for ruling a society
B.
the society's established virtues
C.
the traditional doctrines and justice
D.
the out-of-date moral conducts
【单选题】如果保证合同对保证期间未约定或约定不明，则自主债务履行届满之日起 ( )，债权人未要求保证人承担保证责任，保证人免除保证责任。
A.
6个月内
B.
1年内
C.
2年内
D.
3年内
【单选题】According to the passage, all of the following are true concerning the process of negative feedback EXCEPT
A.
By diminishing errors, negative feedback allows systems to correct themselves.
B.
Negative feedback always arises out of a system where several factors are interacting.
C.
Negative feedback sometimes causes a disturbed system to over-correct, resulting in an impressed change opposite to the original disturbance.
D.
Negative feedback is less important, on the whole, than departure from equilibrium.
E.
Ideally, negative feedback gradually diminishes, allowing a system to find its desired course.
【单选题】Crippen was absent from the DNB ______.
A.
because he escaped to the U.S.
B.
because death sentence had been abolished
C.
for reasons not clarified
D.
because of the editors' mistake
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