For centuries, medical pioneers have refined a variety of methods and medicines to treat sickness, injury, and disability, enabling people to live longer and healthier lives.

“A salamander (a small lizard-like animal) can grow back its leg. Why can't a human do the same?” asked Peruvian-born surgeon Dr. Anthony Atala in a recent interview. The question, a reference to work aiming to grow new limbs for wounded soldiers, captures the inventive spirit of regenerative medicine. This innovative field seeks to provide patients with replacement body parts. These parts are not made of steel; they are the real things --- living cells, tissue, and even organs.

Regenerative medicine is still mostly experimental, with clinical applications limited to procedures such as growing sheets of skin on burns and wounds. One of its most significant advances took place in 1999，when a research group at North Carolina’s Wake Forest Institute for Regenerative Medicine conducted a successful organ replacement with a laboratory-grown bladder. Since then, the team, led by Dr. Atala, has continued to generate a variety of other tissues and organs 一 from kidneys to ears.

The field of regenerative medicine builds on work conducted in the early twentieth century with the first successful transplants of donated human soft tissue and bone. However, donor organs are not always the best option. First of all, they are in short supply, and many people die while waiting for an available organ; in the United States alone, more than 100,000 people are waiting for organ transplants. Secondly, a patient’s body may ultimately reject the transplanted donor organ. An advantage of regenerative medicine is that the tissues are grown from a patient’s own cells and will not be rejected by the body’s immune system.

Today, several labs are working to create bioartificial body parts. Scientists at Columbia and Yale Universities have grown a jawbone and a lung. At the University of Minnesota, Doris Taylor has created a beating bioartificial rat heart. Dr. Atala’s medical team has reported long-term success with bioengineered bladders implanted into young patients with spina bifida (a birth defect that involves the incomplete development of the spinal cord). And at the University of Michigan, H. David Humes has created an artificial kidney.

So far, the kidney procedure has only been used successfully with sheep, but there is hope that one day similar kidney will be implantable in a human patient. The continuing research of scientists such as these may eventually make donor organs unnecessary and, as a result, significantly increase individuals'chances of survival.

1. In the latest field of regenerative medicine, what are replacement parts made of?

A. Cells, tissues and organs of one’s own.

B. Rejected cells, tissues and organs.

C. Donated cells, tissues and organs.

D. Cells, tissues and organs made of steel.

2.What have scientists experimented successfully on for a bioartificial kidney?

A. Patients. B. Rats. C. Soldiers. D. Sheep.

3.Why is generative medicine considered innovative?

A. It will strengthen the human body’s immune system.

B. It will provide patients with replacement soft tissues.

C. It will make patients live longer with bioartificial organs.

D. It will shorten the time patients waiting for a donated organ.

4.What is the writer’s attitude towards regenerative medicine?

A. Doubtful. B. Reserved. C. Positive. D. Negative.

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Step into a Prius, and turn on the engine．The first thing you notice is how much quieter it is than a traditional car．At this point, the car’s gasoline engine is at rest．The electric motor will provide power until the car reaches about 24 kilometers per hour．If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.

The computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two．If you go over 24 kilometers per hour, when you step on the gas, you are actually telling the computer how fast you want to go.

The electronic motor recharges automatically using a set of batteries．When driving at a high speed, the gasoline engine not only powers the car, but also charges the batteries.

Any time you use the brake, the electric motor will work like a generator（發(fā)電機(jī)）and produce electricity to recharge the batteries．As a result, the car’s batteries will last for around 200,000 miles.

1.Which of the following pictures can show how the power system of Prius works correctly?（W—Wheel of the car, E.M—electric motor, G.E—gasoline engine, C—computer, B—batteries）

A．

B．

C．

D．

2.What is the most important characteristic of hybrid cars?

A． They are powered by both a rechargeable battery and gasoline.

B． They have smaller engines than traditional gasoline ones.

C． They use only 99 percent of their power to run up hills.

D． They are much quieter than traditional cars.

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A． the batteries can be recharged at any time you want

B． using the brake suggests that the gasoline engine should work

C． the gasoline engine charges the batteries as well as powering the car

D． the car’s batteries will last for around 200,000 miles without being recharged

4.The author writes this passage mainly to ___________.

A． announce plans to develop hybrid cars for the Chinese market

B． let people know how to save their gasoline when driving a car

C． teach people how to drive a hybrid car

D． introduce a new kind of “green” car

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