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One of the major problems of nuclear energy is the inability of scientists to discover a safe way to dispose of the radioactive wastes which occur throughout the nuclear process. Many of these wastes remain dangerously active for tens of thousands of years, while others have a life span closer to a quarter of a million years. Various methods have been used to date, but all have revealed weaknesses, forcing scientists to continue their search.
The nuclear process involves several stages, with the danger of radioactivity constantly present. Fuel for nuclear reactors comes from uranium ore, which, when mined,, spontaneously produces radioactive substances as byproducts. This characteristic of uranium ore went undetected for a long time resulting in the death, due to cancer, of hundreds of uranium miners.
The United States attempted to bury much of its radioactive waste material in containers made of steel covered in concrete and capable of holding a million gallons. For a long time it was believed that the nuclear waste problem had been solved, until some of these tanks leaked, allowing the radioactive wastes to seep into the environment. Canada presently stores its nuclear waste in underwater tanks, with the long-term effects largely unknown.
However, plans are under consideration for above-ground storage of spent fuel from reactors. These plans include the building of three vast concrete containers, which would be two stories high and approximately the length and width of two football fields. Other suggestions include enclosing the waste in glass blocks and storing them in underground caverns, or placing hot containers in the Antarctic region, where they would melt the ice, thereby sinking down adverse effect on the ice sheets.

A:remain above ice sheets B:be safe to environment C:be highly probable D:remain under sea

Passage Three Harry Potter fans will instantly recognize the snowy owl as Harry’s famous companies, Hedwig, but these beautiful owls are easily recognizable not for their magical associations, but for their large size and striking while feathers. Snowy owls are, in fact, the only white owl, and they are a highly sought after species for many birdwatchers to add to their life lists. Foods: Small mammals, birds, fish. Habitat and Migration: Snowy owls are found in far northern latitudes including tundra, a vast treeless frozen region in the Arctic. Their breeding grounds (繁殖地） are in the Arctic tundra, and they migrate south throughout Canada during the winter. In exceptionally server winters or when food supplies are searce, these owls can appear much further south than their normal range. While principally a North American bird, they can also migrate to the northern areas of Europe an Asia. Behaviour: Snowy owls, like all owls, are powerful animal bunters that are active mostly at night but can bunt and feed during the day, especially when food supplies are low. These owls will rest on the ground or on rocks, stumps and other low favorable points. Males can be fierce when defending the nest, and both genders will also perform an “injured bird” act to tempt animal invaders to go away from the nest. Reproduction: Snowy owls may incubate (孵卵) 3-10 eggs for 30-34 days, or the incubation may be done primarily by the freak. The baby owls remain in the nest for 14-21 days and will attempt their first flight when they are 42-58 days old. Mated pairs will raise one group of young birds per year unless food supplies are inadequate and then no eggs may be produced. What will snowy owls probably do when food is insufficient

A:They may stop producing eggs B:They will reduce their flights C:They will be less active at night D:They will only hunt during he day

第一篇： What Is Death? People in the past did not question the difference between life and death. They could see that a person died when his heart stopped beating. People have learned, however, that the body does not die immediately when the heart stops beating. They discovered that we remain alive as long as our brain remains active. Today the difference between life and death is not as easy to see as in the past. Modern medical devices can keep the heart beating and the lungs breathing long after the brain stops. But is this life? This question has caused much debate among citizens in the United States. Many of them want a law that says a person is dead when the brain dies. A person should be considered dead when brain waves stop even if machines can keep the body alive. Such a law would permit doctors to speed removal(切除) of undiseased（没病的）organs for transplant（移植） operations. The brain is made of thousands of millions of nerve cells. These cells send and receive millions of chemical and electrical messages every day. In this way the brain controls the other body activities. Nerve-cell experts say it usually is easy to tell when the brain has died. They put small electrodes(电极) on a person’s skull (头骨) to measure the electrical signals that pass in and out of the brain. These brain waves are recorded on a television screen or on paper. The waves move up and down every time the brain receives messages from the nerve cells. The brain is dead when the waves stop moving. Although there are people who oppose the idea of a law on brain block for variouis reasons, the idea of brain wave activity as a test of death is slowly being accepted. More and more people are beginning to accept the idea that a person is dead

A:when the heart stops beating. B:when the brain becomes less active. C:when doctors stop medical treatment. D:when the brain stops working.

A Bluetooth device can be either a master or a slave and any of the devices within a ___30___can be the master. There is only one master and there can be up to ___31___ active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to ___32___.parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to ___33___ mode before it can become active. Within a network, all ___34___ communications are prohibited.

A:master B:standby slave C:parked slave D:Active slave

A Bluetooth device can be either a master or a slave and any of the devices within a (1) can be the master. There is only one master and there can be up to (2) active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to (3) parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to (4) mode before it can become active. Within a network, all (5) communications are prohibited.

A:master B:standby slave C:parked slave D:active slave

下面程序的结果是　　　#include＜iostream．h＞　　　class test{ private：　　　　　　　　　int num；　　　　　　　public：　　　　　　　　test( )；　　　　　　　　int getint( ) {return num；}　　　　　　　　～test( )；}；　　　test：：test( )　　　{ num=0；}　　　test：：～test( )　　　{ cout＜＜"Destructor is active"＜＜endl；}　　　void main( )　　　{ test x[3]；　　　　　cout＜＜"Exiting main"＜＜endl；}

A:Exiting main　　Destructor is active　　Destructor is active　　Destructor is active B:Exiting main　　Destructor is active　　Destructoris active C:Exiting main　　Destructoris active D:Exiting main

下面程序的结果是（ ）。 　　　#include＜iostream．h＞ 　　　class test{ private： 　　　　　　　　　int num； 　　　　　　　public： 　　　　　　　　test( )； 　　　　　　　　int getint( ) {return num；} 　　　　　　　　～test( )；}； 　　　test：：test( ) 　　　{ num=0；} 　　　test：：～test( ) 　　　{ cout＜＜"Destructor is active"＜＜endl；} 　　　void main( ) 　　　{ test x[3]； 　　　　　cout＜＜"Exiting main"＜＜endl；}

A:Exiting main 　　Destructor is active 　　Destructor is active 　　Destructor is active B:Exiting main 　　Destructor is active 　　Destructoris active C:Exiting main 　　Destructoris active D:Exiting main

下面程序的结果是（ ）。 　　　#include＜iostream．h＞ 　　　class test{ private： 　　　　　　　　　int num； 　　　　　　　public： 　　　　　　　　test( )； 　　　　　　　　int getint( ) {return num；} 　　　　　　　　～test( )；}； 　　　test：：test( ) 　　　{ num=0；} 　　　test：：～test( ) 　　　{ cout＜＜"Destructor is active"＜＜endl；} 　　　void main( ) 　　　{ test x[3]； 　　　　　cout＜＜"Exiting main"＜＜endl；}

A:Exiting main 　　Destructor is active 　　Destructor is active 　　Destructor is active B:Exiting main 　　Destructor is active 　　Destructoris active C:Exiting main 　　Destructoris active D:Exiting main