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提问人：网友allenchien
发布时间：2022-01-06
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His great changes surprised us.A．beatB．soldC．amazedD．conformed
His great changes surprised us.
A．beat
B．sold
C．amazed
D．conformed
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更多“His great changes surprised us.A．beatB．soldC．amazedD．conformed”相关的问题
第2题
Identify all superfluous nouns and then rewrite using verbs or adjectives: Modification of this procedure is therefore of considerable necessity.
第3题
He never speaks to me _______ to ask for something.
A、more than
B、rather than
C、or rather
D、other than
第5题
Hercules was given many difficult tasks because the king wanted to get rid of him.
A．Right
B．Wrong
C．Not mentioned
第6题
According to the author, the most important change in the American family in the 20th century is that ______.
A．the wife and husband live with dependent children
B．the family income has grown a lot
C．the wife is no longer responsible for taking care of the children
D．the wife has joined the work force
第9题
Clone Farm
Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology needed to "clone" chickens on a massive scale. Once a chicken with desirable traits has been bred or genetically engineered, tens of thousands of eggs, which will hatch into identical copies, could roll off the production lines every hour. Billions of clones could be produced each year to supply chicken farms with birds that all grow at the same rate, have the same amount of meat and taste the same.
This, at least, is the vision of the US's National Institute of Science and Technology, which has given Origen Therapeutics of Burlingame, California, and Embrex of North Carolina $4.7 million to help fund research. The prospect has alarmed animal welfare groups, who fear it could increase the suffering of farm birds.
That's unlikely to put off the poultry industry, however, which wants disease-resistant birds that grow faster on less food. "Producers would like the same meat quantity but to use reduced inputs to get there," says Mike Fitzgerald of Origen. To meet this demand, Origen aims to "create an animal that is effectively a clone", he says. Normal cloning doesn't work in birds because eggs can't be removed and implanted. Instead, the company is trying to bulk-grow embryonic stem cells taken from fertilized eggs as soon as they're laid, "The trick is to culture the cells without them starting to distinguish, so they remain pluripotent," says Fitzgerald.
Using a long-established technique, these donor cells will then be injected into the embryo of a freshly laid, fertilized recipient egg, forming a chick that is. a "chimera". Strictly speaking a chimera isn't a clone, because it contains cells from both donor and recipient. But Fitzgerald says it will be enough if, say, 95 percent of a chicken's body develops from donor cells. "In the poultry world, it doesn't matter if it's not 100 percent," he says.
Another challenge for Origen is to scale up production. To do this, it has teamed up with Embrex, which produces machines that can inject vaccines into up to 50,000 eggs an hour. Embrex is now trying to modify the machines to locate the embryo and inject the cells into precisely the right spot without killing it.
In future, Origen imagines freezing stem cells from different strains of chicken. If orders come in for a particular strain, millions of eggs could be produced in months or even weeks. At present, maintaining all the varieties the market might call for is too expensive for breeders, and it takes years to breed enough chickens to produce the billions of eggs that farmers need.
Which statement is the best description of the new era of factory farming according to the first paragraph？
A．Eggs are all genetically engineered.
B．Thousands of eggs are produced every hour.
C．Cloned chickens are bull-produced with the same growth rate, weight and taste.
D．Identical eggs can be hatched on the production lines.
第10题
America's national parks are like old friends. You may not see them for years at a time, but just knowing they're out there makes you feel better. Hearing the names of these famous old friends--Yosemite, Yellowstone, Grand Canyon--revives memories of visits past and promotes dreams of those still to come.
From Acadia to Zion, 369 national parks are part of a continually evolving system. Ancient fossil beds, Revolutionary War battlefields, magnificent mountain ranges, and monuments to heroic men and women who molded this country are all a part of our National Park System (NPS). The cafe and preservation for future generations of these special places is entrusted to the National Park Service. Uniformed Rangers, the most visible representatives of the Service, not only offer park visitors a friendly wave, a helpful answer, or a thought-provoking history lesson, but also are skilled rescuers, firefighters, and dedicated resource protection professionals. The National Park Service ranks also include architects, historians, archaeologists, biologists, and a host of other experts who preserve and protect everything from George Washington's teeth to Thomas Edison's wax recordings.
Modern society has brought the National Park Service both massive challenges and enormous opportunities. Satellite and computer technologies are expanding the educational possibilities of a national park beyond its physical boundaries. Cities struggling to revive their urban cores are turning to the Park Service for expert assistance to preserve their cultural heritage, create pocket parks and green spaces, and re-energize local economies: Growing communities thirsty for recreational outlets are also working with the NPS to turn abandoned railroad tracks into bike and hiking trails, as well as giving unused federal property new life as recreation centers.
To help meet these challenges and take advantage of these opportunities, the National Park Service has formed partnerships--some dating back 100 years, some only months old--with other agencies, state and local governments, corporations, American Indian tribes and Alaska Natives, Park Friends groups, cooperating associations, private organizations, community groups and individuals who share the National Park ethic.
National Park Week 1996 is a celebration of these partnerships.
Why are America's national parks like old friends？
A．Because they are always out there.
B．Because they are very old.
C．Because they make people feel better.
D．Because they are very famous.
