Having arrived at the spot.they set out the old tomb. A. to dig B. digging C. to digging D. dug 题目和参考答案——青夏教育精英家教网—

题目内容

Having arrived at the spot，they set out the old tomb.

A. to dig B. digging

C. to digging D. dug

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――I hope that you and Smith can become good friends.

―― . If only Smith had the same idea.

A. My pleasure B By no means C. I think not D By all means

The factory is in the east of the city.

A. lie B. lay C. located D. lain

He demanded that the racial discrimination in his country.

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Japanese doctors have used thin sheets of tissue(肌肉组织)from people’s cheeks repair damaged corneas（角膜）. A team from Osaka University transplanted thin layers of cheek cells onto the eyes of four patients with a rare and painful eye condition，reports BBC online. Patients whose vision had been cloudy could see well afterwards，and the“new corneas”remained clear more than a year after the operation.

Doctors can also take cells from a healthy eye and grow them in a dish to produce a new cornea，or they can transplant corneas from donors（捐献者）. But these techniques may not work when both eyes are too badly damaged by accident or disease.

The team hope their work may help solve the problem and lead to other types of grow－your－own tissue transplants. The cornea is the clear layer of cells on the surface of the eye. It can be damaged by trauma（外伤）or by a range of diseases.

The team worked with four patients who had a painful condition that causes cloudy corneas and dry eyes. Often the eye can regenerate(再生) cornea cells but none of the four patients had this ability. The researchers took a 3 mm－wide square of tissue from inside the mouth（cheeks）and grew it into a thin layer in the lab. They used a special low temperature technique to separate a very thin sheet off each batch. They then laid that onto the patient’s eye. The cell layers stuck onto the eye and developed into tissue that looked and acted like a healthy cornea.

However，long－term follow－up and experience with a large series of patients is needed to assess the benefits and risks this method. Yet，“it does offer the potential（潜能）of treating severe eye diseases that are resistant to standard approaches，”said the head of the research，Kohji Nishida.

48. Now doctors can repair the damaged corneas with the following methods Except_______.

A. by using mouth tissue

B. by taking cells from a healthy eye and growing them in a dish

C. by transplant corneas from another person

D. by using finger tissue

49. If both eyes are too badly damaged，we can treat them _________.

A. only by using mouth tissue

B. by taking cells from a healthy eye and growing them in a dish

C. by transplant healthy corneas from donors

D. by none of the mentioned method

50. We can infer from the passage___________.

A. the new technique can be widely used in the operations

B. the new technique needs to be further tested

C. the new technique has more benefits than risks

D. any new technique has risks

51. Which of the following is the best title？

A. A new invention

B. A new technique

C. Mouth tissue can restore your vision

D. Transplanting can restore your vision

You can come to my home this Sunday if .

A. you are convenient B. you will be he convenient

C. it is convenient to you D. it will be convenient

Shortly after we _____, a waiter came over to our table with a smile.

A. seated B. were seated C. sat ourselves. D. take place

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