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A.cover the surfaces
B.alter the surfaces
C.alter dimension
D.vary appearance
答案
更多“Common surface treatments can be divided into()”相关的问题
第1题
A．is affected by changes in pressure
B．has a permanent structure
C．forms a free surface
D．is considerably more common
第2题
According to the following sentences, which is the most suitable definition on diving？
A．Diving (underwater), act of entering water and remaining below the surface to explore, to work, or simply to have fun.
B．Diving (underwater), act of exploring water below the surface.
C．Diving (underwater), act of jumping into the water, the most common form. of diving is sport diving, or recreational diving.
D．Diving (underwater), act of going into water and remaining above the surface to explore, to work, or simply to have fun.
第3题
Alzheimer’s Disease: Are We Close to Finding a Cure？
First described in 1906 by Dr.Alois Alzheimer, Alzheimer s disease is the most common form. of dementia, accounting for around 60%–80% of cases.It is characterized by problems with memory, thinking and behavior.Onset is most common in individuals aged 65 and over, although people in their 40s and 50s can develop what is classed as early - onset Alzheimer’s.
Alzheimer’s is a progressive disease, meaning memory loss is mild in the beginning, but it worsens over time to the extent that individuals are unable to have conversations or respond to their surroundings.There are treatments that have been approved by the US
Food and Drug Administration (FDA) for Alzheimer’s.For example, cholinesterase inhibitors and memantine can help treat memory and thinking problems.But these drugs just help manage the symptoms; there is currently no cure for the disease.
Current Alzheimer’s prevalence in the US makes it the 6th leading cause of death, killing more than half a million seniors every year.To put this in perspective, Alzheimer’s disease currently kills more people each year than prostate cancer and breast cancer combined.There is no doubt that scientists across the world are working hard to find ways to prevent, treat and cure this debilitating condition.Hardly a day goes by without coming across a report about how scientists restored memory and learning deficits in Alzheimer’s mouse models, how vitamin D deficiency could increase the risk of developing dementia, and how DNA methylation in the brain is linked to Alzheimer’s.But what have these studies taught researchers about Alzheimer’s so far？
Preventing and Targeting Plaques and Tangles
As with all diseases, knowing exactly what causes Alzheimer’s is key to identifying ways to prevent and treat the condition.Past research has indicated that Alzheimer’s occurs when two abnormal brain structures — plaques and tangles —damage and kill nerve cells, causing the memory, thinking and behavioral problems associated wit
1.Dementia is not a single disease in itself, but a general term to describe symptoms of impairment in memory, communication, and thinking.()
2.The FDA - approved drugs, like cholinesterase inhibitors and memantine, can cure Alzheimer’s disease.()
3.chronic sleep deprivation may cause these abnormal brain structures.()
4.Tangles are fragments of a protein called beta - amyloid, which build up in areas between nerve cells.()
5.As a result of Alzheimer’s research, there are an array of drugs in development that scientists believe have great potential to effectively treat the disease.()
第4题
听力原文： Americans love pets. Many pet owners treat their furry friends as part of the family. If they have an eye for fashion, pet owners can dress their pets in stylish clothes. For special occasions, they can use perfume to make their dogs smell well. You might say Americans treat their pets like they treat their children—sometimes even better. In America, there are more households with pets than those with children. At least 43 percent of U. S. homes have pets of some sort. Exotic creatures, such as monkeys, snakes and even wolves, find a home with some Americans. More common pets include tropical fish, mice and birds. But the all time favorites are cats and dogs, even at the White House. The Bushes’ dog, Spot, has replaced the Clintons’ cat, Socks. Leading a dog’s life in America isn’t such a bad thing. Many grocery stores sell delicious pet foods to owners eager to please their pets. In Houston, Texas, dogs can have their dinner delivered to their homes, just like pizza. Pets can even accompany their owners on vacation. Fancy hotels are beginning to accommodate both man and pets. Furry guests in hotels can enjoy delicious meals served on fine china and sleep in soft beds. The average American enjoys having pets around, and for good reasons. Researchers have discovered that interacting with animals lowers a person’s blood pressure. Dogs can offer protection from burglars and unwelcome visitors. Cats can help the home get rid of pests. Little creatures of all shapes and sizes can provide companionship and love. In many cases, having a pet prepares 32 a young couple for the responsibilities of parenthood. Pets even encourage social relationships: They give their owners an appearance of friendliness, and they provide a good topic of conversation.
(33)
A．Presidents like to keep pets.
B．Pets can offer protection for owners.
C．Pets can encourage social relationships.
D．Pets are good companies to many old people.
第5题
M: Yes. Unfortunately, that's a common problem with books made from wood pulp.
W: I suppose that to make paper from wood you have to add a lot of chemicals and acids to make it turn white.
M: Exactly, and it's the acid that eventually cat's away the paper.
W: Oh, that actually makes sense, but this book's not even 75 years old and I've seen books in museum that are hundreds of years old and they're in fine condition.
M: Well, you see, books have been made from wood pulp only since the 1850s, before that they were made from materials mostly animals' skins, and no chemicals were added.
W: It's a shame those older wood pulp books are going to fall apart some day. Is there anything that can be done to preserve them？
M: En, currently the only way to stop the books from decaying is to remove the binding and treat each page individually to remove the acid.
W: That doesn't sound very economical.
M: No, it isn't. It's not practical to treat a large number of book's with this process, so we only try to rescue the most valuable edition books in our collection.
W: Well, thanks for the explanation. I'd better get back to my project.
M: Good luck and I hope the old book will bold long enough for you to finish it.
(23)
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books decay.
第6题
M: Yes, Unfortunately, that's a common problem with books made from wood pulp.
W: I suppose that to make paper from wood you have to add a lot of chemicals and acids to make it tam white.
M: Exactly, and it's the acid that eventually eats away the paper.
W: Oh, that actually makes sense, but this book's not even 75 years old and I've seen books in museum that are hundreds of years old and they're in fine condition.
M: Well, you see, books have been made from wood pulp only since the 1850s, before that they were made from materials mostly animals' skins, and no chemicals were added.
W: It's a shame those older wood pulp books are going to fall apart some day. is there anything that can be done to preserve them？
M: En, currently the only way to stop the books from decaying is to remove the binding and treat each page individually to remove the acid.
W: That doesn't sound very economical.
M: No, it isn't. It's not practical to treat a large number of books with this process, so we only try to rescue the most valuable edition books in our collection.
W: Well, thanks for the explanation. I'd better got back to my project.
M: Good luck and I hope the old book will hold long enough for you to finish it.
(27)
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books decay.
第7题
The study estimated that there are a(n) 【C9】______ of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not 【C10】______ fainting and dizziness are the most frequent complaints. 【C11】______ 13% of them— roughly four a day are serious enough to 【C12】______ a pilot to change course. The most common of the serious emergencies 【C13】______ heart trouble, strokes, and difficulty breathing.
Let's face it: plane rides are 【C14】______ . For starters, cabin pressures at high altitudes are set at roughly 【C15】______ they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty 【C16】______ , but passengers with heart disease 【C17】______ experience chest pains as result of the reduced amount of oxygen flowing through their blood. 【C18】______ common in- flight problem is deep venous thrombosis— the so-called economy class syndrome (综合症). 【C19】______ happens, don't panic. Things are getting better on the in-flight- emergency front. Thanks to more recent legislation, flights with at 【C20】______ one attendant are starting to install emergency medical kits to treat heart attacks.
【C1】
A．called
B．addressed
C．informed
D．surveyed
第8题
Officials from the U. S. government's National Institutes of Health said they hope the study, to be conducted at 105 locations throughout the United States, can help identify early-life influences that affect later development, with the goal of learning new ways to treat or prevent illness.
The study will examine hereditary and environmental factors such as exposure to certain chemicals that affect health.
Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air, water, dust and materials used to construct their residences, the NIH said.
Officials said more than $ 200 million has been spent already and the study is projected to cost $ 3.2 billion.
"We anticipate that in the long term, what we learn from the study will result in a significant savings in the nation's health care costs," Dr. Duane Alexander, who heads the NIH 's Eunice Kennedy Shriver National Institute of Child Health and Human Development, told reporters.
The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up pregnant women whose babies will then be followed to age 21.
Some of the early findings will be about factors behind pre-term birth, which has become more common in recent years, according to Dr. Peter Scheidt of the NIH, who heads the study.
The people taking part will be from rural, urban and suburban areas, from all in- come and educational levels and from all racial groups, the NIH said.
The aim of the study is to find new ways to______.
A．conduct research
B．track public health
C．prevent or treat illness
D．speed up development
第9题
M: Yes, unfortunately, that's a common problem with books made from wood pulp.
W: I suppose to make paper from wood that you have to add a lot of chemicals and acids to make it turn white.
M: Exactly and it's the acid that eventually eats away the paper.
W: Oh, that actually make sense, but this book's not even 75 years old and I've seen books in museum that are hundreds of years old and they're in fine condition.
M: Well, you see, books have been made from wood pulp only since the 1850's, before that they were mostly made from materials like animals' skins, and no chemicals were added.
W: It's a shame those older wood pulp books are going to fall apart some day. Is there anything that can be clone to preserve them？
M: Eh, currently the only way to stop the books from decaying is to remove the binding and treat each page individually to remove the acid.
W: That doesn't sound very economical.
M: No, it isn't. It's not practical to treat a large number of books with this process, so we only try to rescue the most valuable 1st edition books in our collection.
W: Well, thanks for the explanation. I'd better get back to my project.
M: Good luck, and I hope the old book holds long enough for you to finish it.
(20)
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books deteriorate.
