()and ensuring understanding are the keys to effective reading.

A.输入

B.键盘

C.关键

D.调子

A. In the DH key exchange process, the session key is never passed across the network.

B. In the DH key exchange process, the public and private keys are mathematically related using the DH algorithm.

C. In the DH key exchange process, the session key is passed across the network to the peer for confirmation.

D. In the DH key exchange process, the public and private keys are not mathematically related, ensuring higher security

Keys to success in online selling: understanding that customers use ___________ for lots of different reasons understanding what the customer wants when they’re on your website and try and ________ that information providing good ______ and good information being very clear about the ___________of the product being very clear about any __________that are running alongside those products being very clear to the customer about what the ________ options are for each individual product.

Public Key Infrastructure(PKI) service providers offer organizations fully integrated PKI-managed services designed to secure Intranet, Extranet, Virtual Private Network(VPN), and e-commerce applications. PKI solutions can enable a number of security services, including strong authentication and non-repudiation of transactions.eToken enables the users of PKI systems to generate and store(101)and digital certificates inside the token, creating a secure environment and allowing full portability and maximum ease of use. eToken Pro can also perform. sensitive on-chip(102)operations, ensuring that users' keys axe never exposed to the PC environment, eToken eliminates the need to store(103)and keys on a hard disk or browser file, or to transmit them across the Internet/Extranet; assuring peace-of-mind and confidence during online communications.A digital signature is created using the private key of an individual to ensure the Validity of his request. This technology can be used to guarantee(104)of various transactions. The strength of either the authentication level or the digital signature relies on the level of protection offered to the private key. eToken Pro offers the maximum level of security, since it enables the use of the private key for signing and authenticating inside the eToken.The most secure use of authentication involves enclosing at least one certificate with every signed message. The message(105)verifies the certificate using the CA's public key. If the sender's public key is legitimate, the recipient verifies the message's signature. Digital signatures created with a private key are verified with the digital certificate containing the public key.

A．private keys

B．public keys

C．authentication codes

D．message digests

选出应填入下面一段英语中______内的正确答案。

Public Key Infrastructure (PKI) service providers offer organizations fully integrated PKI-managed services designed to secure Intranet, Extranet, Virtual Private Network (VPN), and e-commerce applications. PKI solutions can enable a number of security services, including strong authentication and non-repudiation oftransaction.

eToken enables the users of PKI systems to generate and store(1)and digital certifications inside the token, creating a secure environment and allowing full portability and maximum ease of use. eToken Pro can also perfonn sensitive on-chip(2)operations, ensuring that users' keys are never exposed to PC environment, eToken eliminates the need to store(3)and keys on a hard disk or browser file, or to transmit them across the Internet/Extranet, assuring peace-of-mind and confidence during online communications.

A digital signature is created using the private key of an individual to ensure the validity of his request. This technology can be used to guarantee(4)of various transactions. The strength of either the authentication level or the digital signature relies on the level of protection offered to the private key. eToken PRO offers the maximum level of security, since it enables the use of the private key for signing and authenticating inside the eToken.

The most secure use of authentication involves enclosing at least one certificate with every signed message. The message(5)verifies the certificate using the CA's public key. If the sender's public key is legitimate, the recipient verifies the message's signature. Digital signatures created with a private key are verified with the digital certificate containing the public key.

The author's main objection to Bush's proposal seems to be ______.

A．that it is not effective

B．that it ignores sound educational policy

C．that it is not well grounded

D．that it is no innovation

A．One of the simplest and most important is through a positive feedback loop, where a master transcription regulator activates transcription of its own gene,in addition to that of other cell-typespecific genes. Each time a cell divides, the regulator is distributed to both daughter cells, where it continues to stimulate the positive feedback loop.？The continued stimulation ensures that the regulator will continue to be produced in subsequent cell generations.？Positive feedback is crucial for establishing the “self-sustaining” circuits of gene expression that allow a cell to commit to a particular fate—and then to transmit that decision to its progeny.

B．Although positive feedback loops are probably the most prevalent way of ensuring that daughter cells remember what kind of cells they are meant to be,there are other ways of reinforcing cell identity. One involves the methylation of DNA．In vertebrate cells, DNA methylation occurs on certain cytosine bases. This covalent modification generally turns off the affected genes by attracting proteins that bind to methylated cytosines and block gene transcription. DNA methylation patterns are passed on to progeny cells by the action of an enzyme that copies the methylation pattern on the parent DNA strand to the daughter DNA strand as it is synthesizeD

C．Another mechanism for inheriting gene expression patterns involves the modification of histones. When a cell replicates its DNA,each daughter double helix receives half of its parent’s histone proteins, which contain the covalent modifications that were present on the parent chromosom

E．Enzymes responsible for these modifications may bind to the parental histones and confer the same modifications to the new histones nearby. It has been proposed that this cycle of modification helps reestablish. the pattern of chromatin structure found in the parent chromosome

D．Because all of these cell-memory mechanisms transmit patterns of gene expression from parent to daughter cell without altering the actual nucleotide sequence of the DNA,they are considered to be forms of epigenetic inheritanc

E．These mechanisms, which work together, play an important part in maintaining patterns of gene expression, allowing transient signals from the environment to be remembered by our cells—a fact that has important implications for understanding how cells operate and how they malfunction in diseas

E．

A．The？responsibility？of？respecting？privacy？applies？to？AI？professionals？in？a？particularly？profound？way.？Technology？enables？the？collection,？monitoring,？and？exchange？of？personal？information？quickly,？inexpensively,？and？often？without？the？knowledge？of？the？people？affecte

D．？Therefore,？an？AI？professional？should？become？conversant？in？the？various？definitions？and？forms？of？privacy？and？should？understand？the？rights？and？responsibilities？associated？with？the？collection？and？use？of？personal？information.

B．AI？professionals？should？only？use？personal？information？for？legitimate？ends？and？without？violating？the？rights？of？individuals？and？groups.？This？requires？taking？precautions？to？prevent？re-identification？of？anonymized？data？or？unauthorized？data？collection,？ensuring？the？accuracy？of？data,？understanding？the？provenance？of？the？data,？and？protecting？it？from？unauthorized？access？and？accidental？disclosure

C．AI？professionals？should？establish？transparent？policies？and？procedures？that？allow？individuals？to？understand？what？data？is？being？collected？and？how？it？is？being？used,？to？give？informed？consent？for？automatic？data？collection,？and？to？review,？obtain,？correct？inaccuracies？in,？and？delete？their？personal？dA

D．Only？the？minimum？amount？of？personal？information？necessary？should？be？collected？in？a？system.？The？retention？and？disposal？periods？for？that？information？should？be？clearly？defined,？enforced,？and？communicated？to？data？subjects.？Personal？information？gathered？for？a？specific？purpose？should？not？be？used？for？other？purposes？without？the？person’s？consent.？Merged？data？collections？can？compromise？privacy？features？present？in？the？original？collections.？Therefore,？AI？professionals？should？take？special？care？for？privacy？when？merging？data？collections.