Five cloned pigs，whose organs are much less likely to be rejected(排斥) by a patient，have been born in the U．S.More than 62,000 people in the U．S. alone are -高中英语-n多题

◎ 题干

Five cloned pigs，whose organs are much less likely to be rejected(排斥) by a patient，have been born in the U．S.
More than 62,000 people in the U．S. alone are waiting to ____ donated hearts，lungs and so on.The number of human donors falls far short of ____.Pig organs are of a(n) ____ size to human organs，and some scientists hope they might be used to help meet the ____.But previous attempts to transplant pig tissue into humans have ____.
The five pigs ____ a gene that adds a sugar to the surface of pig cells.The sugar would ____ immune(免疫的) rejection of the tissue.“This advance provides a neartime ____ for overcoming the problem that there is not enough human organs for transplants，”says an expert.“This is the ____ gene for overcoming the ____ stage of rejection.”
____，scientists warn that much more work is necessary ____ organs from copies of the pigs could be transplanted into humans.Human genes will need to be added，to ____ rejection of the organ in the long term.There are also ____ that pig viruses could infect patients.
Cloning techniques were ____ to the production of the pigs.Genes can only be knocked out(去除) in a single cell.Cloning of these single cells then allowed the ____ of a whole animal in which the gene was knocked out in every cell.But the PPL researchers have ____ in knocking out only one copy of the gene.The team will now attempt to knock out both copies of the gene.
The team will also ____ tests to investigate whether a virus from the pigs could infect human cells.“Although a lot of the work is very ____，we’re still very far off being able to grow an organ，” says Julia，who is working on this project and quite ____ to creating similar knockout pigs with researchers at the University of Missouri.

小题1:

A．exchange	B．check
C．possess	D．receive

小题2:

A．discussion	B．demand
C．doubt	D．distance

小题3:

A．beneficial	B．identical
C．similar	D．certain

小题4:

A．shortage	B．condition
C．satisfaction	D．argument

小题5:

A．continued	B．failed
C．finished	D．paused

小题6:

A．lack	B．include
C．make	D．change

小题7:

A．leave	B．cause
C．block	D．destroy

小题8:

A．supply	B．ambition
C．contribution	D．solution

小题9:

A．only	B．rare
C．key	D．safe

小题10:

A．last	B．whole
C．next	D．early

小题11:

A．However	B．Therefore
C．Besides	D．Finally

小题12:

A．because	B．before
C．if	D．after

小题13:

A．prevent	B．ignore
C．judge	D．weaken

小题14:

A．regrets	B．emotions
C．concerns	D．interests

小题15:

A．simple	B．vital
C．unusual	D．basic

小题16:

A．collection	B．application
C．reception	D．creation

小题17:

A．delighted	B．succeeded
C．joined	D．believed

小题18:

A．conduct	B．plan
C．design	D．study

小题19:

A．perfect	B．strange
C．exciting	D．disappointing

小题20:

A．opposed	B．used
C．devoted	D．suited

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◎ 知识点

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