It is difficult to get used ________ in a tent after having soft, comfortable bed to l

a unreadable by a third party.the goal of steganography is to hide the data from a third party.In this article,I will discuss what steganography is,what purposes it serves,and will provide an example using available software. There are a large number of steganographic（2）that most of us are familiar with(especially if you watch a lot of spymovies),ranging from invisible inkandmicrodotstosecretingahiddenmessageinthesecondletterofeachwordofalargebodyoftextandspreadspectrumradiocommunication.With computersandnetworks,there arem any other ways of hiding informations,suchas: Covertchannels(c,g,Lokiandsomedistributeddenial-of-servicetoolsusetheInternetControl（3）Protocol,orICMP,asthecommunicationchannelbetweenthe“badguy”andacompromicyedsystem) HiddentextwithinWebpages Hidingfilesin“plainsight”(c,g.whatbetterplaceto“hide”afilethanwithanimportantsoundingnameinthec:\winntsystem32directory) Nullciphers(c,g,usingthefirstletterofeachwordtoformahiddenmessageinanotherwiseinnocuoustext) steganographytoday,however,issignificantlymore（4）than the example about suggest,allowing ausertohidelargeamountsofinformationwithinimageandaudio.Theseformsofsteganographyoftenareusedinconjunctionwith cryptographysothe information is double protected;firstitisencryptedandthenhiddensothatanadvertisementfirst.find the information(an often difficult task inandofitself)and the decryptedit. The simple stapproachtohidingdatawithinanimagefileiscalled（5）signatureinsertion.In this method,we can take the binaryrepresentationofthehiddendataandthebitofeachbytewithinthecovertimage.If weareusing 24-bitcolor the amount and will be minimum and indiscriminate to the human eye.

A.Cryptography

B.Geography

C.Stenography

D.Steganography@@@SXB@@@A.methods

B.software

C.tools

D.services@@@SXB@@@A.Member

B.Management

C.Message

D.Mail@@@SXB@@@A.powerful

B.sophistication

C.advanced

D.easy@@@SXB@@@A.least

B.most

C.much

D.less

very complex. Generally speaking, the Accounts Department is __1__ for calculations of pay, while the Personnel Department is interested in discussions with the employees about pay.

If a firm wants to __2__ a new wage and salary structure, it is essential that the firm should decide on a __3__ of job evaluation and ways of measuring the performance of its employees. In order to be __4__, that new pay structure will need agreement between Trade Unions and employers. In job evaluation, all of the requirements of each job are defined in a detailed job description. Each of thsoe requirements is given a value, usually in "points", which are __5__ together to give a total value for the job. For middle and higher management, a special method is used to evaluate managers on their knowledge of the job, their responsibility, and their __6__ to solve problems. Because of the difficulty in measuring management work, however, job grades for managers are often decided without __7__ to an evaluation system based on points.

In attempting to design a pay system, the Personnel Department should __8__ the value of each job with these in the job market. __9__, payment for a job should vary with any differences in the way that the job is performed. Where it is simple to measure the work done, as in the works done with hands, monetary encouragement schemes are often chosen, for __10__ workers, where measurement is difficult, methods of additional payments are employed.

[A]compare

[B]responsible

[C]useful

[D]added

[E]find

[F]reference

[G]indirect

[H]method

[I]successful

[J]combined

[K]Necessarily

[L]capacity

[M]ability

[N]Basically

[O]adopt

9;s oceans now (27)heat at twice the rate they did 18 years ago. Around half of ocean heat intake since 1865 has taken place since 1997, researchers report online in Nature Climate Change.

Warming waters are known to (28)to coral bleaching(珊瑚白化) and they take up more space than cooler waters, raising sea (29). While the top of the ocean is studied, its depths are more difficult to (30)The researchers gathered 150 years of ocean temperature data in order to get better (31)of heat absorption from surface to seabed. They gathered together temperature readings collected by everything from a 19th century (32)of British naval ships to modern automated ocean probes. The extensive data sources, (33)with computer simulations(计算机模拟), created a timeline of ocean temperature changes, including cooling from volcanic outbreaks and warming from fossil fuel (34).

About 35 percent of the heat taken in by the oceans during the industrial era now residents at a (35)of more than 700 meters, the researchers found. They say they&39;re unsure(36)whether the deep-sea warming canceled out warming at the sea&39;s surface.

A absorb

B combined

C contribute

D depth

E emission

F.explore

G explore

H.floor

I.heights

J.indifferent

K level

L.mixed

M picture

N unsure

O voyage

twenty years now. Not only has demand been 36 , but the oil we have been finding is coming from places that are 37 to reach. At the same time, more of this newly 38 oil is of the type that requires a greater investment to 39 . And because demand for this precious resource will grow, according to some, by over 40 percent by 2025, fueling the world’s economic 40 will take a lot more energy from every possible source.

The energy industry needs to get more from existing fields while continuing to search for new 41 . Automakers must continue to improve fuel efficiency and perfect hybrid (混合动力的) vehicles. Technological improvements are needed so that wind, solar and hydrogen can be more 42 parts of the energy equation. Governments need to formulate energy policies that promote 43 and environmentally sound development. Consumers must be willing to pay for some of these solutions, while practicing conservation efforts of their own.

Inaction is not an 44 . So let’s work together to balance this equation. We are taking some of the 45 needed to get started, but we need your help to go the rest of the way.

A) consequently

B) cultivate

C) declining

D) derived

E) difficult

F) discovered

G) economically

H) exception

I) feasible

J) growth

K) Option

L) refine

M) reserves

N) soaring

O) steps

A.difficult

B.is difficult

C.it is difficult

D.that is difficult

nB–Mny boy students think mth is _____ English. --Igree. I’m wek in English.much difficult thn B．so difficults C．less difficult thn D．more difficult thn

A．much difficult than

B．so difficult as

C．less difficult than

D．more difficult than

Good writing should be difficult and straight.()

参考答案：错误

A.less difficult

B.the more difficult

C.the difficult

D.more difficult

t oneI think Mths is ________ ofll my subjects.much difficult one B．difficult one C．most difficult one D．the most difficult one

A．much difficult one

B．difficult one

C．most difficult one

D．the most difficult one