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David Bennett, a 57 - year - old man from the US, received the world's first pig heart transplant（移植）on January 7th, 2022. He died two months later on March 9th.
It may sound like a failure, but it actually is a big step forward for xenotransplantation（异种器官移植）.
Xenotransplantation has been a hot topic in medical research（研究）for many years. Doctors and scientists look for ways to work out the big problem of organ（器官）transplant waiting lists. In the US alone, over 100 000 patients are on a list waiting for new organs. Many of them will die before getting their chance to receive a heart, a kidney（肾）or other important organs. As a result, medical science has turned to animal organs.
Doctors have experimented（试验）with xenotransplantation since the early 20th century. There are few successes. Usually, patients' bodies reject（排斥）the animal organs. Bennett lived much longer than other xenotransplantation patients. That's because scientists removed（去掉）pig genes（基因）that would cause fast rejection. Then they added human genes to help the body accept the organ.
In fact, Bennett's case was not the only success. Doctors at New York University attached（连接）gene - edited（基因编辑）pig kidneys to a human patient's blood vessels（血管）outside of the body in 2021. Doctors at University of Alabama put the gene - edited pig kidneys inside a patient's body in the same year.
Though（尽管）these successes are short - lived, they show that there may be a way forward for xenotransplantation. “A lot of new information will come out. The development of this field will benefit from it and move forward at faster speed,” Muhammad Mohiuddin, director of the transplant programme, told the Guardian.
（ ）1. What can we infer（推断）from Paragraph 3?
A. Human organs are expensive.
B. Many patients died because of the organ transplant.
C. Compared（相比）with human organs, animal organs are easier to get.
D. Patients cannot accept the animal organs in their bodies.
（ ）2. According to Paragraph 4, what may be the main problem of xenotransplantation?
A. Patients' ideas. B. Bodies' rejection.
C. The high price. D. The number of organs.
（ ）3. What does the underlined word “benefit” mean in Chinese in the last paragraph?
A. 得益 B. 赞扬 C. 传播 D. 涉及
（ ）4. What does the writer think of xenotransplantation?
A. It should be stopped because of the death cases.
B. It has become very popular.
C. It is too difficult to carry on.
D. It is valuable（有价值的）and people should keep on researching.
It may sound like a failure, but it actually is a big step forward for xenotransplantation（异种器官移植）.
Xenotransplantation has been a hot topic in medical research（研究）for many years. Doctors and scientists look for ways to work out the big problem of organ（器官）transplant waiting lists. In the US alone, over 100 000 patients are on a list waiting for new organs. Many of them will die before getting their chance to receive a heart, a kidney（肾）or other important organs. As a result, medical science has turned to animal organs.
Doctors have experimented（试验）with xenotransplantation since the early 20th century. There are few successes. Usually, patients' bodies reject（排斥）the animal organs. Bennett lived much longer than other xenotransplantation patients. That's because scientists removed（去掉）pig genes（基因）that would cause fast rejection. Then they added human genes to help the body accept the organ.
In fact, Bennett's case was not the only success. Doctors at New York University attached（连接）gene - edited（基因编辑）pig kidneys to a human patient's blood vessels（血管）outside of the body in 2021. Doctors at University of Alabama put the gene - edited pig kidneys inside a patient's body in the same year.
Though（尽管）these successes are short - lived, they show that there may be a way forward for xenotransplantation. “A lot of new information will come out. The development of this field will benefit from it and move forward at faster speed,” Muhammad Mohiuddin, director of the transplant programme, told the Guardian.
（ ）1. What can we infer（推断）from Paragraph 3?
A. Human organs are expensive.
B. Many patients died because of the organ transplant.
C. Compared（相比）with human organs, animal organs are easier to get.
D. Patients cannot accept the animal organs in their bodies.
（ ）2. According to Paragraph 4, what may be the main problem of xenotransplantation?
A. Patients' ideas. B. Bodies' rejection.
C. The high price. D. The number of organs.
（ ）3. What does the underlined word “benefit” mean in Chinese in the last paragraph?
A. 得益 B. 赞扬 C. 传播 D. 涉及
（ ）4. What does the writer think of xenotransplantation?
A. It should be stopped because of the death cases.
B. It has become very popular.
C. It is too difficult to carry on.
D. It is valuable（有价值的）and people should keep on researching.
答案
1 - 4 CBAD
