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[单选]甘肃陇南“宕昌”的正确拼音注释是（）。
A．A.DànchāngB.TàngchāngC.TōngchāngD.Dàngchāng
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[单选]一个人不能失忆，一个国家当然就更不能失忆了，但是因为历史的原因，有时候会有意无意地试图______某方面的回忆。对于这种无奈的现实，我们能够理解，但是并不是说就应该支持或者默认这么做。在具备了条件之后，我们还是应该寻找和______我们的记忆。依次填入划横线部分最恰当的一项是：
A．回避恢复
B．隐藏修复
C．躲避还原
D．掩盖复原
A．回避恢复
B．隐藏修复
C．躲避还原
D．掩盖复原
[单选]美国一项新研究发现，人体生理反应的节奏跟昼夜交替一致，一旦这个节奏被破坏，人们免疫系统的抗病能力就会降低。如果以下各项为真，最能削弱上述观点的是：
A．坐飞机到不同时区易产生头疼反胃等时差综合症
B．熬夜易使胃酸分泌过多而诱发胃溃疡病症
C．长跑运动后立即大量饮水容易破坏体内代谢平衡而致病
D．免疫系统先天缺陷的病人，即使正常饮食患病概率也很高
A．坐飞机到不同时区易产生头疼反胃等时差综合症
B．熬夜易使胃酸分泌过多而诱发胃溃疡病症
C．长跑运动后立即大量饮水容易破坏体内代谢平衡而致病
D．免疫系统先天缺陷的病人，即使正常饮食患病概率也很高
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic device such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation (航空)industry, has recommended that all airlines ban (禁止)such devices from being used during “critical”stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft‘s computers. Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable (易受损的)to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can‘t hear the instructions to turn off his radio because the music‘s too loud.
1.The passage is mainly about ________.
A) a new regulation for al airlines
B) the defects of electronic devices
C) a possible cause of aircraft crashes
D) effective safety measures for air flight
2.What is said about the over 100 aircraft incidents in the past 15 years?
A) They may have been caused by the damage to the radio systems.
B) They may have taken place during take-off and landing.
C) They were proved to have been caused by the passengers portable computers.
D) They were suspected to have resulted from electromagnetic interference.
3.Few airlines want to impose a total ban on their passengers using electronic devices because ________.
A) they don‘t believe there is such a danger as radio interference
B) the harmful effect of electromagnetic interference is yet to be proved
C) most passengers refuse to take a plane which bans the use of radio and cassette players
D) they have other effective safety measures to fall back on
4.Why is it difficult to predict the possible effects of electromagnetic fields on an airplane‘s computers?
A) Because it is extremely dangerous to conduct such research on an airplane.
B) Because it remains a mystery what wavelengths are liable to be interfered with.
C) Because research scientists have not been able to produce the same effects in labs.
D) Because experts lack adequate equipment to do such research.
5.It can be inferred from the passage that the author ________.
A) is in favor of prohibiting passengers‘use of electronic devices completely
B) has overestimated the danger of electromagnetic interference
C) hasn‘t formed his own opinion on this problem
D) regards it as unreasonable to exercise a total ban during flight
RTCA, an organization which advises the aviation (航空)industry, has recommended that all airlines ban (禁止)such devices from being used during “critical”stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft‘s computers. Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable (易受损的)to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can‘t hear the instructions to turn off his radio because the music‘s too loud.
1.The passage is mainly about ________.
A) a new regulation for al airlines
B) the defects of electronic devices
C) a possible cause of aircraft crashes
D) effective safety measures for air flight
2.What is said about the over 100 aircraft incidents in the past 15 years?
A) They may have been caused by the damage to the radio systems.
B) They may have taken place during take-off and landing.
C) They were proved to have been caused by the passengers portable computers.
D) They were suspected to have resulted from electromagnetic interference.
3.Few airlines want to impose a total ban on their passengers using electronic devices because ________.
A) they don‘t believe there is such a danger as radio interference
B) the harmful effect of electromagnetic interference is yet to be proved
C) most passengers refuse to take a plane which bans the use of radio and cassette players
D) they have other effective safety measures to fall back on
4.Why is it difficult to predict the possible effects of electromagnetic fields on an airplane‘s computers?
A) Because it is extremely dangerous to conduct such research on an airplane.
B) Because it remains a mystery what wavelengths are liable to be interfered with.
C) Because research scientists have not been able to produce the same effects in labs.
D) Because experts lack adequate equipment to do such research.
5.It can be inferred from the passage that the author ________.
A) is in favor of prohibiting passengers‘use of electronic devices completely
B) has overestimated the danger of electromagnetic interference
C) hasn‘t formed his own opinion on this problem
D) regards it as unreasonable to exercise a total ban during flight
[单选]研究的价值除了以结果的可靠性为条件，还须依赖于（）
A．假设的正确性
B．方法的科学性
C．实验的成功率
D．内容的思想性
A．假设的正确性
B．方法的科学性
C．实验的成功率
D．内容的思想性
设总供给函数为yS＝2000＋P，总需求函数为yD＝2400－P，求，
(1)求供求均衡点。
(2)如果总需求曲线向左(平行)移动10%，求新的均衡点并把该点与(1)的结果相比较。
(3)如果总供给曲线向左(平行)移动10%，求新的均衡点并把该点与(1)的结果相比较。
(1)求供求均衡点。
(2)如果总需求曲线向左(平行)移动10%，求新的均衡点并把该点与(1)的结果相比较。
(3)如果总供给曲线向左(平行)移动10%，求新的均衡点并把该点与(1)的结果相比较。