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1. 阅读理解
Heart disease is one of the major killers in the
world today. Many who suffer from it must have heart transplants. However, it's
difficult to get a suitable heart donation, and even if a patient survives the
wait, his or her body often rejects the heart.
But there is now new hope for sufferers of heart
disease. According to a study published in the journal Advanced Science,
researchers from Israel's Tel Aviv University printed a 3D human heart on April
15.
"This is the first time anyone anywhere has
successfully engineered and printed an entire heart," professor Tal Dvir
told CNN. Unlike the previous 3D-printed heart structure, the new heart is
complete with cells, blood vessels, chambers and other structures a heart needs
to function normally. But scientists still have more to figure out before the
3D-printed heart can be fitted into the body. For one thing, the experimental
heart is only the size of a thumb. And, although it can contract like a muscle,
it cannot pump out blood like a real one. At present, the heart prototype is
like a tiny airplane that has all of the right parts, but can't fly.
However, the development is still regarded as a
major breakthrough in medicine.
In the experiment, the researchers turned human
fat tissue into human heart tissue with stem cell technology. The tissue was
then turned into "bio-ink" for a 3D printer to ensure that tissue in
the heart came from the patients themselves. So ideally, if it were to be
placed in the body of someone in need of a transplant, there would be less risk
of organ rejection. "Patients will no longer have to wait for transplants
or take medications to prevent their rejection," researchers told USA
Today. "Instead, the needed heart will be printed, fully personalized for
every patient."
But the scientists think that 3D printing can be
used to create other human organs. They foresee a time when the 3D printing of
organs will be an everyday medical practice. "Maybe, in 10 years, there
will be organ printers in the finest hospitals around the world and these
procedures will be conducted routinely," Dvir said.
（1）Why do scientists have to do further research before fitting the 3D-printed heart into the body?
A . Because the heart is incomplete.
B . Because the heart can't pump out blood.
C . Because the heart is an airplane that can't fly.
D . Because the heart can't contract like a muscle.
（2）What can we infer from the last two paragraphs?
A . The needed heart will be printed to meet every patient's need.
B . The 3D printing of organs will be an unusual medical practice.
C . Dvir has a negative attitude towards the future of organ printers.
D . Patients will need medicines to stop their rejection for their heart transplant.
（3）What can serve as the best title for the passage?
A . Organ printers in the hospitals.
B . How to get a suitable heart donation.
C . Heart disease: one of the major killers.
D . A 3D-printed heart: new hope for heart disease sufferers.
