在脊柱骨折中，下列各项符合脊柱不稳定型骨折标准的是 A．椎体骨折压缩超过1/3 B．

受复杂月面环境的影响，中国首辆月球车“玉兔号”的机构控制出现异常。虽经地面科研人员的检修，“玉兔号”月球车已全面苏醒，但是机构控制异常的原因仍有待进一步排查。这表明

①事物发展是前进性与曲折性的统一

②对于客观事物的联系人们无能为力

③自在事物的联系不以人的意志为转移

④认识总要受到具体实践水平的限制

A．①③

B．②③

C．①④

D．②④

It’s twelve now. Let’s have ____.             [ ]

A. dinner  

B. breakfast  

C. /  

D. lunch

某工程，采用无标底公开招标方式选定施工单位，合同工期380天，共有A、B、C、D、E、F投标单位通过资格预审，并在投标截止时间前提交了投标文件。

工程实施过程中发生了以下事件：

事件1：评标时，发现A投标单位的投标文件只加盖了公章，但没有投标单位法定代表人的签字，只有法定代表人授权书中被授权人的签字；B投标单位因施工工艺落后投标报价明显高于其他投标单位；C投标单位合同工期按定额工期400天；D投标单位投标文件中的总价金额汇总有误。

事件2：经评标委员会评审，推荐D、F、E投标单位依次为前3名中标候选人。在中标通知书发出前，建设单位要求监理单位分别找D、F、E投标单位重新报价，以价格低的E单位为中标单位，按原投标报价签订施工合同后，建设单位与中标单位再以新报价签订协议书作为实际履行合同的依据。监理单位认为建设单位的要求不妥，并提出了不同意见，建设单位最终接受了监理单位的意见，确定D投标单位为中标单位。

 事件3：开工前，总监理工程师组织召开了第一次工地会议，并要求D单位及时办理施工许可证，确定工程水准点、坐标控制点，按政府有关规定及时办理施工噪声和环境保护等相关手续。

事件4：开工前，设计单位组织召开了设计交底会。会议结束后，总监理工程师整理了一份《设计修改建议书》，提交给设计单位。

事件5：施工开始前，建设单位提出要求，总监理工程师应主持召开第一次工地会议、每周一次的工地例会以及所有专业性监理会议，负责编制各专业监理实施细则，负责工程计量，主持整理监理资料。

事件2中，建设单位的要求违反了招标投标有关法规的哪些具体规定。

阅读理解。

    The biggest safety threat facing airlines today may not be a terrorist (恐布分子) 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

(电磁) interference (干扰). 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 (禁止) 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 prediction 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 is too loud.

1. The passage is mainly about _____. [ ]

A. effective safety measure of aircraft crashes

B. a possible cause for air flight accidents

C. the defects (缺点) of electronic devices

D. a new regulation for all airlines

2. What is said about the over 100 aircraft incidents in the past 15 years? [ ]

A. They may have taken place during take-off and landing.

B. They may have been caused by the damage to the radio systems.

C. They were suspected to have resulted from electromagnetic interference.

D. They were proved to have been caused by the passengers' portable computers.

3. Few airlines want to impose (强加) a total ban on their passengers using electronic

   devices because _____. [ ]

A. they have other effective safety measures to fall back on

B. they don't believe there is such a danger as radio interference

C. the harmful effect of electromagnetic interference is yet to be proved

D. most passengers refuse to take a plane which bans the use of radio and cassette players

4. Why is it difficult to predict the possible effects of electromagnetic fields on an

   airplane's computers? [ ]

A. Because experts lack adequate equipment to d such research.

B. Because it is extremely dangerous to conduct such research on an airplane.

C. Because it remains a mystery what wavelengths are liable to e interfered with.

D. Because research scientists have not been able to produce the same effects in labs.

5. It can be inferred from the passage that the author _____. [ ]

A. hasn't formed his own pinion on this problem

B. has overestimated the danger of electromagnetic interference

C. thinks it is unreasonable to exercise a total ban during flight

D. is in favor of prohibiting passengers' use of electronic devices completely

根据代理权产生的根据不同，代理可以分为( )。

A．委托代理

B．直接代理

C．法定代理

D．间接代理

E．指定代理