Violent criminals with something to hide have more reason than ever to be paranoid about a tap on the shoulder which could send them to jail. Queensland police are working through a backlog of unsolved murders with some dramatic success. Greater cooperation between the public and various law enforcement agencies is playing a role, but new genetic-testing techniques are the real key to providing the vital evidence to mount a prosecution.
Evidence left behind at the scene of any murder is guaranteed to outlive the person who left it. A blood, saliva or tissue sample the size of a pin, kept dry and out of sunlight, will last several thousand years. From it, scientific analysis now can tell accurately the sex of the person who left it.
When matched against a sample from a crime suspect, it can indicate with million-to-one certainty whether the samples come from the same source. Only twins share identical DNA. So precise is the technology if the biological parents of a suspect agree to provide a sample, forensic scientists can work out the rest for themselves without cooperation from the suspect.
Queensland forensic scientists have been using the DNA testing technology since 1992, and last year they were recognized internationally for their competence in positive individual identification. That is part of the reason 20 of Queensland’s most puzzling unsolved murders dating to 1952 are being actively investigated. There also have been several recent arrests for unsolved murders.
Forensic evidence was instrumental in charges being laid over the bashing death of waitress Tasha Douty on Brampton Island in 1983. Douty’s blood-splattered, naked body was found on a nude sunbathing beach at Dinghy Bay on the island. Footprints in the sand indicated that the killer had grappled with the 41-year-old mother who had fled up the beach before being caught and beaten to death.
According to Leo Freney, the supervising forensic scientist at the John Tonge Centre at Brisbane’s Griffith University, DNA testing has become an invaluable tool for police. Its use is in identifying and rejecting suspects. In fact, he says, it eliminates more people that it convicts.
"It is easily as good as fingerprints for the purpose of identification," he says. "In the case of violent crime it is better than fingerprints. You can’t innocently explain things like blood and semen at a crime scene where you may be able to innocently explain fingerprints. " In Queensland, a person who has been arrested on suspicion of an offence can be taken before a magistrate and ordered to provide a sample of body fluid by force if necessary.
The power of the new forensic technology is shown in the fact that it can ______.

A:work out a result even without the suspect’s cooperation B:eliminate more suspects than identify them C:make use of evidence several thousand years later D:take a sample of the suspect’s body fluid by force

Violent criminals with something to hide have more reason than ever to be paranoid about a tap on the shoulder which could send them to jail. Queensland police are working through a backlog of unsolved murders with some dramatic success. Greater cooperation between the public and various law enforcement agencies is playing a role, but new genetic-testing techniques are the real key to providing the vital evidence to mount a prosecution.
Evidence left behind at the scene of any murder is guaranteed to outlive the person who left it. A blood, saliva or tissue sample in the size of a pin, kept dry and out of sunlight, will last several thousand years. From it, scientific analysis now can tell accurately the sex of the person who left it.
When matched against a sample from a crime suspect, it can indicate with million-to-one certainty whether the samples come from the same source. Only twins share identical DNA. So precise is the technology if the biological parents of a suspect agree to provide a sample, forensic scientists can work out the rest for themselves without cooperation from the suspect.
Queensland forensic scientists have been using the DNA testing technology since 1992, and last year they were recognized internationally for their competence in positive individual identification. That is part of the reason 20 of Queensland’s most puzzling unsolved murders dating to 1932 are being ac timely investigated. There also have been several recent arrests for unsolved murders.
Forensic evidence was instrumental in charges being laid over the bashing death of waitress Tasha Douty on Brampton Island in 1983. Douty’s blood-splattered, naked body was found on a nude sunbathing beach at Dinghy Bay on the island. Footprints in the sand indicated that the killer had grappled with the 21-year-old mother who had fled up the beach before being caught and beaten to death.
According to Leo Freney, the supervising forensic scientist at the John Tonge Centre at Brisbane’s Griffith University, DNA testing has become an invaluable tool for police, its use is in identifying and rejecting suspects. In fact, he says, it eliminates more people than it convicts.
" It is easily as good as fingerprints for the purpose of identification, " he says. "In the case of violent crime it is better than fingerprints. You can’t innocently explain things like blood and semen at a crime scene where you may be able to innocently explain fingerprints. " In Queensland, a person who has been arrested on suspicion of an offence can be taken before a magistrate and ordered to provide a sample of body fluid by :force if necessary.
By the use of new technology, forensic scientists can______.

A:work out the result of DNA completely by themselves B:eliminate more suspects than identify them C:tell the appearance of a murder from the evidence left D:order the suspect to provide a sample of body fluid by law

Cheerleaders for renewable energy are fond of pointing out that patches of desert receive enough energy each year from sunlight to power the entire world. But few could explain how the construction of the millions of solar cells required to convert that energy into electricity would be financed. Public utility bosses and policymakers tend to dismiss wind and solar power as noble but expensive distractions, sustainable only through huge subsidies. But new studies suggest that renewables might not be as dear as skeptics suspect.
In a report that was due out on July 6th, Greenpeace, an environmental group, argues that public utilities would save money by investing in renewables. Windmills may cost more to build, the logic runs, but they do not require the purchase of fuel, unlike coal or gas-fired power plants. Those future fuel costs, Greenpeace says, massively outweigh the extra investment costs of renewables. If nuclear power were phased out and renewables’ share of electricity generation rose dramatically, it calculates the average annual savings between 2004 and 2030 would be $180 billion.
These figures, of course, rely on all sorts of questionable assumptions. In Greenpeace’s picture, the prices of gas and coal will rise, despite stagnating consumption of the former, and a steep drop in demand for the latter. It also helps that the future as Greenpeace sees it includes a big dose of energy efficiency, although its business-as-usual projections do not. Public utilities, at any rate, must not be making the same assumptions, since they continue to invest in power plants run on fossil fuels.
Other studies make a slightly less sweeping claim: that adding wind power to the electricity network can reduce the overall cost of electricity. The cost of producing wind power is almost nothing, since the fuel—wind—is free. So on a windy day, the cheapest power comes from wind turbines. That power, in turn, displaces electricity generation from sources with higher fuel costs, such as gas-fired plants. So power prices tend to fall when the wind is blowing. Nuon, a Dutch utility, calculates that in 2005 the average power price on the local spot market was over Euro 45 per megawatt hour when there was no wind, but under Euro 30 when the average wind-speed topped 13 metres per second.
Researchers in Denmark have gone a step further and put a value on this effect. They believe that wind power saved 1 billion kroner ($ 167m) off Danish electricity bills in 2005. On the other hand, Danish consumers also paid 1.4 billion kroner in subsidies for wind power. But this year, reckons Rune Moesgaard of the Danish Wind Industry Association, wind power will actually save consumers’ money for the first time, as the benefits resulting from lower power prices outweigh the falling cost of the subsidy.
According to the author, cheerleaders for renewable energy

A:are optimistic about the finance of the solar power construction. B:could hardly explain how solar cells convert sunlight into electricity. C:in general ignore the cost of the solar power construction. D:suspect that solar cells in desert are expensive.

Violent criminals with something to hide have more reason than ever to be paranoid about a tap on the shoulder which could send them to jail. Queensland police are working through a backlog of unsolved murders with some dramatic success. Greater cooperation between the public and various law enforcement agencies is playing a role, but new genetic-testing techniques are the real key to providing the vital evidence to mount a prosecution.
Evidence left behind at the scene of any murder is guaranteed to outlive the person who left it. A blood, saliva or tissue sample the size of a pin, kept dry and out of sunlight, will last several thousand years. From it, scientific analysis now can tell accurately the sex of the person who left it.
When matched against a sample from a crime suspect, it can indicate with million-to-one certainty whether the samples come from the same source. Only twins share identical DNA. So precise is the technology if the biological parents of a suspect agree to provide a sample, forensic scientists can work out the rest for themselves without cooperation from the suspect.
Queensland forensic scientists have been using the DNA testing technology since 1992, and last year they were recognized internationally for their competence in positive individual identification. That is part of the reason 20 of Queensland’s most puzzling unsolved murders dating to 1952 are being actively investigated. There also have been several recent arrests for unsolved murders.
Forensic evidence was instrumental in charges being laid over the bashing death of waitress Tasha Douty on Brampton Island in 1983. Douty’s blood-splattered, naked body was found on a nude sunbathing beach at Dinghy Bay on the island. Footprints in the sand indicated that the killer had grappled with the 41-year-old mother who had fled up the beach before being caught and beaten to death.
According to Leo Freney, the supervising forensic scientist at the John Tonge Centre at Brisbane’s Griffith University, DNA testing has become an invaluable tool for police. Its use is in identifying and rejecting suspects. In fact, he says, it eliminates more people that it convicts.
"It is easily as good as fingerprints for the purpose of identification," he says. "In the case of violent crime it is better than fingerprints. You can’t innocently explain things like blood and semen at a crime scene where you may be able to innocently explain fingerprints. " In Queensland, a person who has been arrested on suspicion of an offence can be taken before a magistrate and ordered to provide a sample of body fluid by force if necessary.

A:work out a result even without the suspect’s cooperation B:eliminate more suspects than identify them C:make use of evidence several thousand years later D:take a sample of the suspect’s body fluid by force

Little ______ that their plan has been discovered.（　）

A:did they suspect B:do they suspect C:do they suspect D:they suspect

Little ______ that their plan has been discovered.

A:they suspect B:do they suspect C:they suspected D:did they suspect

If you suspect that the illness might be serious you should not ______ going to the doctor.

A:put off B:put aside C:hold back D:hold up

The police arrested the suspect yesterday and released him this morning.

A:freed B:relieved C:kicked D:liberated