题目内容
（请给出正确答案）
About one quarter of the workers in the country are employed in factories.
A．third
B．fourth
C．tenth
D．fifteenth
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A、alert
B、gentle
C、fierce
D、handsome
A.Methane becomes less poisonous
B.Methane is turned into a fertilizer
C.Less methane reaches the atmosphere
D.Air becomes cleaner
A.The earth's fuel reserves will be accessible for the next 50 years
B.There'will soon be an energy crisis
C.Conventional reserves will soon become inaccessible
D.Fuel demand will decline
？？A patient on the brink ofdeath has received the world's first self-contained artificial heart-a bat-tery powered device about the size of a softball that runs without the need forwires, tubes or hoses sticking out of the chest.？？？？
？？ Two surgeons from the University of Louisvilleimplanted the titanium and plastic pump during a seven-hour operation at JewishHospital Monday. The hospital said the patient was "awake andre-sponsive" Tuesday and resting comfortably. It refused to releasepersonal details.
？？ The patient had been expectedto die within a month without the operation, and doctors said they expected theartificial heart to extend the person's life by only a month But the device isconsidered a major step toward improving the patient's quality of life.？？
？？ The new pump, called AbioCor, is also a technological leap from the mechanical hearts used in the 1980s,which were attached by wires and tubes to bulky machinery outside the body. Themost fa- mous of those, the Jarvic-7, used air as a pumping device and wasattached to an apparatus about the size of a washing machine.？？
？？ "I think it'spotentially a major step forward in the artificial heart development,"said Dr. David Faxon, president of the American Heart Association. However, hesaid the dream of an implantable, permanent artificial heart is not yet areality: "This is obviously an experimental device whose long-term successhas to be demonstrated. " Only about half of the 4, 200 Americans on awaiting list for donor hearts receivedthem last year, and most of the rest died:？？
？？ Some doctors, includingRobert Higgins, chairman of cardiology at the Medical Colle？？ge of Virgin-ia in Richmond, said artificial hearts are unlikely to replacedonor hearts.
？？ "A donor heart in a goodtransplant can last 15 t0 30 years, " he said. "It's going to be hardto re-place that with a machine. "
？？ The Abil Cor has a 2-poundpumping unit, and electronic controls that adjust the pumping？？ speed based onthe body's needs. It is powered by a small battery pack worn outside the bodythat transmits current through the skin.
The pump of the first implanted self-contained heart was made of titanium andplastic？？？？？？？？？？？？
A.Right
B.Wrong
C.Not mentioned
A.pressing one's ankle.
B.a tight bandage
C.applying a cold pack
D.bleeding under the skin
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