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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 near?time ____ 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 knock?out pigs with researchers at the University of Missouri.
1.A.exchange? B．check
C．possess? D．receive
2.A.discussion? B．demand
C．doubt? D．distance
3.A.beneficial? B．identical
C．similar? D．certain
4.A.shortage? B．condition
C．satisfaction? D．argument
5.A.continued? B．failed
C．finished? D．paused
6.A.lack? B．include
C．make? D．change
7.A.leave? B．cause
C．block? D．destroy
8.A.supply? B．ambition
C．contribution? D．solution
9.A.only B．rare
C．key? D．safe
10.A.last? B．whole
C．next? D．early
11.A.However? B．Therefore
C．Besides? D．Finally
12.A.because? B．before
C．if? D．after
13.A.prevent B．ignore
C．judge? D．weaken
14.A.regrets? B．emotions
C．concerns? D．interests
15.A.simple? B．vital
C．unusual? D．basic
16.A.collection? B．application
C．reception? D．creation
17.A.delighted? B．succeeded
C．joined? D．believed
18.A.conduct? B．plan
C．design? D．study
19.A.perfect? B．strange
C．exciting? D．disappointing
20.A.opposed? B．used
C．devoted? D．suited
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The Food and Drug Administration (FDA) is expected to rule soon that milk from cloned animals and meat from their offspring (后代) are safe to eat.
The agricultural industry has observed a self-acting stop on using the products of clones, but it has recently become clear that a few offspring of cloned pigs and cows are already flowing into the food supply. Many in agriculture believe such genetic copies are the next logical step in improving the nation’s livestock (家畜).
Many Americans are likely to be against the idea of serving clones’ milk to their children or putting meat from the offspring of clones into the kitchens. When they were asked earlier this year in a survey by the International Food Information Council whether they would willingly buy meat, milk and eggs that come from clones if the FDA declared them to be safe, 63 percent of consumers said no.
Yet scientific evidence suggests there is little cause for alarm, at least on food-safety grounds. Studies have shown that meat and milk from clones are not different from that from normal animals, although work is not complete and researchers say that clones do suffer slight genetic abnormalities (反常).
While milk from clones might reach the shelves, clones themselves are not likely to be eaten, since they cost thousands of dollars to produce. They’d be used as breeding stock(培育家畜), so the real question is whether their produced offspring would be safe.
The FDA has been promising a policy for three years, but hasn’t produced a final view, and some biotechnology companies involved in cloning have run out of cash while waiting. Livestock producers have called the FDA the“Foot Dragging Administration”.
1．What is the opinion of most Americans on serving cloned milk to their children?
A．They expect to serve clone milk to their children.
B．They have already fed their children with cloned milk.
C．They believe using the cloned milk is safe enough.
D．They won’t accept cloned milk.
2．What does the underlined sentence mean in the passage?
A．The clones are very rare, so they will never be used as food.
B．The clones cost too much money so it’s worth eating them.
C．The clones cost so much to produce, so they will not be used as food.
D．The FDA will make a decision that the clones are too expensive to eat as food.
3．Why has the FDA been called“Foot Dragging Administration”?
A．Because the FDA hasn’t made final policy in the limited time.
B．Because the FDA have used up their money to make cloned food.
C．Because the FDA doesn’t know whether the cloned meat is safe to eat or not.
D．Because the livestock producers like to play jokes.
4．What is the best title for this passage?
A．The offspring of cloned animals.
B．Clone-generated meat and milk may be accepted.
C．Cloned animal products are dangerous.
D．The new plan on cloned animal products. ?
查看习题详情和答案>>The Food and Drug Administration （FDA） is expected to rule soon that milk from cloned animals and meat from their offspring （后代） are safe to eat.
The agricultural industry has observed a self-acting stop on using the products of clones, but it has recently become clear that a few offspring of cloned pigs and cows are already flowing into the food supply. Many in agriculture believe such genetic copies are the next logical step in improving the nation’s livestock （家畜）.
Many Americans are likely to be against the idea of serving clones’ milk to their children or putting meat from the offspring of clones into the kitchens. When they were asked earlier this year in a survey by the International Food Information Council whether they would willingly buy meat, milk and eggs that come from clones if the FDA declared them to be safe, 63 percent of consumers said no.
Yet scientific evidence suggests there is little cause for alarm, at least on food-safety grounds. Studies have shown that meat and milk from clones are not different from that from normal animals, although work is not complete and researchers say that clones do suffer slight genetic abnormalities （反常）.
While milk from clones might reach the shelves, clones themselves are not likely to be eaten, since they cost thousands of dollars to produce. They’d be used as breeding stock, so the real question is whether their produced offspring would be safe.
The FDA has been promising a policy for three years, but hasn’t produced a final view, and some biotechnology companies involved in cloning have run out of cash while waiting. Livestock producers have called the FDA the “Foot Dragging Administration”.
1．What is the opinion of most Americans on serving cloned milk to their children?
A．They expect to serve clone milk to their children.
B．They have already fed their children with cloned milk.
C．They believe using the cloned milk is safe enough.
D．They won’t accept cloned milk.
2．What does the underlined sentence mean in the passage?
A．The clones are very rare and cost so much to produce, so they will never be used as food.
B．Researchers spent too much money to produce the clones; it’s not worth eating them.
C．The clones cost so much to produce, so they will not be used as food.
D．The FDA will make a decision that the clones are too expensive to eat as food.
3．Why has the FDA been called “Foot Dragging Administration”?
A．Because the FDA hasn’t made final policy in the limited time.
B．Because the FDA have used up their money to make cloned food.
C．Because the FDA doesn’t know whether the cloned meat is safe to eat or not.
D．Because the livestock producers like to play jokes.
4．What is the best title for this passage?
A．The offspring of cloned animals.
B．Clone-generated meat and milk may be accepted.
C．Cloned animal products are dangerous.
D．The new plan on cloned animal products.
查看习题详情和答案>>
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The Food and Drug Administration (FDA) is expected to rule soon that milk from cloned animals and meat from their offspring (后代) are safe to eat.
The agricultural industry has observed a self-acting stop on using the products of clones, but it has recently become clear that a few offspring of cloned pigs and cows are already flowing into the food supply. Many in agriculture believe such genetic copies are the next logical step in improving the nation’s livestock (家畜).
Many Americans are likely to be against the idea of serving clones’ milk to their children or putting meat from the offspring of clones into the kitchens. When they were asked earlier this year in a survey by the International Food Information Council whether they would willingly buy meat, milk and eggs that come from clones if the FDA declared them to be safe, 63 percent of consumers said no.
Yet scientific evidence suggests there is little cause for alarm, at least on food-safety grounds. Studies have shown that meat and milk from clones are not different from that from normal animals, although work is not complete and researchers say that clones do suffer slight genetic abnormalities (反常).
While milk from clones might reach the shelves, clones themselves are not likely to be eaten, since they cost thousands of dollars to produce. They’d be used as breeding stock(培育家畜), so the real question is whether their produced offspring would be safe.
The FDA has been promising a policy for three years, but hasn’t produced a final view, and some biotechnology companies involved in cloning have run out of cash while waiting. Livestock producers have called the FDA the“Foot Dragging Administration”.
72．What is the opinion of most Americans on serving cloned milk to their children?
A．They expect to serve clone milk to their children.
B．They have already fed their children with cloned milk.
C．They believe using the cloned milk is safe enough.
D．They won’t accept cloned milk.
73．What does the underlined sentence mean in the passage?
A．The clones are very rare, so they will never be used as food.
B．The clones cost too much money so it’s worth eating them.
C．The clones cost so much to produce, so they will not be used as food.
D．The FDA will make a decision that the clones are too expensive to eat as food.
74．Why has the FDA been called“Foot Dragging Administration”?
A．Because the FDA hasn’t made final policy in the limited time.
B．Because the FDA have used up their money to make cloned food.
C．Because the FDA doesn’t know whether the cloned meat is safe to eat or not.
D．Because the livestock producers like to play jokes.
75．What is the best title for this passage?
A．The offspring of cloned animals.
B．Clone-generated meat and milk may be accepted.
C．Cloned animal products are dangerous.
D．The new plan on cloned animal products.
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