[不定项选择题]One of the factors that tend to promote social change is__________.
A.joint interest
B.different points of view
C.less emotional people
D.advanced technology

[不定项选择题]共用题干 Hacking
People tend to think of computers as isolated machines,working away all by themselves.
Some do-personal computer without an outside link, like someone's hideaway（隐蔽的）cabin in the woods.But just as most of homes are tied to a community by streets,bus routes and electric lines,computers that exchange intelligence are part of a community-local,national and even global network joined by telephone connections.
The computer network is a creation of the electric age,but it is based on old-fashioned trust. It cannot work without trust. A rogue loose（为所欲为的无赖）in a computer system called hacker（黑客）is worse than a thief entering your house. He could go through anyone's electronic mail or add to,change,distort or delete anything in the information stored in the computer's memory .He could even take control of the entire system by placing his own instructions in the software that runs it.He could shut the computer down whenever he wished,and no one could stop him.Then he could program the computer to erase any sign of his ever having been there.
Hacking,our electronic- age term for computer break-in,is more and more in the news-brainy kids vandalizing university records, even pranking（胡闹）about in supposedly safeguard-ed systems.To those who understand how computer networks are increasingly regulating life in the late 20th century,these are not laughing matters.A potential for disaster is building:A dissatis- fled former insurance-company employee wipes out information from payroll（工资表）files. A student sends out a“virus”,a secret and destructive command,over a national network .The vi-rus copies itself at lightning speed,jamming the entire network-thousands of academic,commer-cial and government computer systems.Such disastrous cases have already occurred.Now exists the possibility of terrorism by computer. Spoiling a system responsible for air-traffic control at a busy airport,or knocking out the telephones of a major city,is a relatively easy way to spread panic .Yet neither business nor government has done enough to toughen its defenses against at-tack .For one thing,such defenses are expensive;for another,they may interrupt communica- tion—the main reason for using computers in the first place. One of the reasons why business or government has not taken tough measures to stop hacking is that______.
A.it will cause fear among the public
B.hacking has not caused much damage
C.tough measures are illegal
D.communication may be interrupted

[不定项选择题]One possible benefit of the experiment discussed in the passage is__________.
A.less crowded cities
B.victory over death
C.protection against fatal injury
D.fewer deaths from heart attacks

[不定项选择题]One characteristic of clinical death is__________.
A.lasting damage to the lungs
B.destruction of the tissues
C.temporary non-functioning of the heart
D.that the organism cannot be revived

[不定项选择题]One reason why employees don't want to trade money for leisure is that__________.
A.they don't want to be considered to be lazy
B.they have to pay a lot of money for leisure
C.their companies are lacking in employees
D.they love their companies so much

[不定项选择题]共用题干 One Good Reason to Let Smallpox Live
It's now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980,when smallpox was eradicated in the wild,by destroying the killer vims in the last two labs that are supposed to have it one in the US and one in Russia. if smallpox had truly gone from the planet,what point was there in keeping these reserves?
_______(51)reality,of course,it was naive to _______(52)that everyone would let ________(53)of such a potent potential weapon. Undoubtedly several nations still have _______(54)vials._______(55)the last“official”stocks of live virus bred mistrust of the Us and Russia,_______ (56)no obvious gain.
Now American researchers have________(57)an animal model of the human disease,opening the________(58)for tests on new treatments and vaccines.So once again there's a good reason to_______(59)the virusjust in_______(60)the disease puts in a reappearance.
How do we_______(61)with the mistrust of the US and Russia?_______(62).Keep the virus________(63)international auspices in a well-guarded UN laboratory that's open to all countries. The US will object,of course,just at it rejects a multilateral approach to just about everything. But it doesn't_______(64)the idea is wrong. If the virus_______(65)useful, then let's make it the servant of all humanity—not just a part of it. 65._________
A.will be
B.would be
C.is
D.are