单选题According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?AThey indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.BThey are less reliable than the evidence from rocks on land in determining the volume of land ice.CThey can be used to deduce the relative volume of land ice that was present when the sediment was laid down.DThey are more unpredictable during an ice age than in other climatic conditions.EThey can be used to determine atmospheric conditions at various times in the past.
单选题
According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?
A
They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.
B
They are less reliable than the evidence from rocks on land in determining the volume of land ice.
C
They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.
D
They are more unpredictable during an ice age than in other climatic conditions.
E
They can be used to determine atmospheric conditions at various times in the past.
参考解析
解析：
细节题。第二段第二句指出：relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments，故可知洋底的氧同位素比例可以用来推算形成时陆冰的体积，故本题应选C项。
细节题。第二段第二句指出：relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments，故可知洋底的氧同位素比例可以用来推算形成时陆冰的体积，故本题应选C项。
相关考题：
Which of the following is NOT TRUE according to the passage？A.The zoo needed more information about the woman.B.A baby elephant was hurt during the war.C.The woman lived quite near the zoo.
29． Which of．the following is NOT true according to the passage?A．It’s more difficult for boys to learn to write．B． Girls often run and throw balls earlier than boys．C． Young boy chimps in Tanzania may hunt and throw sooner than young girl chimps．D． Boys are very athletic．
According to the passage, which is true about the ocean?A. The waters of the ocean came from rain water.B. The ocean was formed from the, lighter rock materials.C. The vast single ocean formed about 200 million years ago.D. The ocean covered the whole surface of the earth at very beginning.
请阅读短文，完成此题。When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas ofhigh rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation.Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.Which of the following statements is TRUE according to the passage?查看材料A．Oceanic salinity has great effect on sea life.B．Many factors combine to cause changes in oceanic salinity.C．The movement of the water is related to the amount of salt.D．The temperature of the water has much to do with the oceanic salinity.
Which of the following is NOT true according to the passage?__________A.Skyscrapers provide more usable space than other buildingsB.The skyscrapers first appeared in the late 1960sC.Where there are skyscrapers, television reception is poorD.The two World Trade Center towers are skyscrapers
Which of the following constitutes the best title for this passage？( ) A.In the Unthinking Age，Seeing is Believing B.Images Matter Less Today Than in the Past C.Democracy Has Lost Its Appeal Nowadays D.Images in the Information Age
Which of the following is true according to the passage？( ) A.The visit lasted only five months. B.The visit coincided with American industrialization. C.The first part was published in 1835； the second part in 1840. D.The second part was more optimistic than the first.
单选题Which of the following statements about the Grimm's fairy tales is TRUE according to the passage?AThey were originally intended to be children's stories.BGenerally speaking, the tales that have endured can help children deal with the challenges life bring to them.CA large number of the tales made it to the modem age.DThey are less violent than the children's stories being written today.
单选题It can be inferred from the passage that the isotope record taken from ocean sediments would be less useful to researchers if which of the following were true?AIt indicated that lighter isotopes of oxygen predominated at certain times.BIt had far more gaps in its sequence than the record taken from rocks on land.CIt indicated that climate shifts did not occur every 100,000 years.DIt indicated that the ratios of oxygen 16 and oxygen 18 in ocean water were not consistent with those found in fresh water.EIt stretched back for only a million years.
单选题According to the passage, which of the following is NOT TRUE?AThe Boston Tea Party took place in 1773.BEuropeans figured out ways to use coffee during the 1670s.CDuring the 1770s, more and more Americans began to drink coffee.DCoffee is a refreshing drink.
单选题According to the passage, which of the following countries attracts more tourists than the others?AItaly.BSpain.CGreece.DFrance.
单选题Which of the following is NOT true according to the passage?AWomen usually suffer from osteoporosis when advanced in years.BWomen tend to be anemic more than men due to menstruation.CGallbladder disease afflicts fewer women than men.DFood high in soy protein can lower cholesterol.
单选题Which of the following is true about email according to the passage?AEmail reduces other forms of contact.BEmail enhances other forms of contact.CAbout 25% of network members are contacted by email weekly.DWith email, people try hard to maintain more relationships.
单选题Which of the following is true according to the passage?ANot all the fires in the forests must be put out.BPeople‘s carelessness leads to dangerous fires.CAustralia allows all the fires to burn naturally.DThere are more fires in Russia than in the USA.
单选题Which of the following statements is NOT true according to the passage?AThe women having children show a rise in cold infections than those without children.BPeople with low income will surely more colds than people with high income.CJuniors are easier to have colds than seniors.DIt has not been proved scientifically that poor nutrition affects susceptibility to colds.
单选题Which of the following is true about habits according to the passage?AThey are natural endowments to living creatures.BThey are more important than instincts to all animals.CThey are subject to the formative influence of the environment.DThey are destined to open out a much more far-reaching possibility in the evolution of human beings.
单选题According to the passage, which of the following is true?AIt is very difficult for the middle-aged to live in America.BAmerica is Kids Country because the majority of the American population is children.CKids Country was taking shape in America when immigrants poured into the country.DAmerica is more of Kids Country than any other countries in the world.
单选题According to the passage, which of the following is NOT true about the woman?AShe is married to a school teacher.BHer eyes move around a lot at times.CShe is ten years older than Jerome.DShe has found what she is looking for.
单选题Which of the following is NOT TRUE according to the passage?AWe will be in trouble if our fat cells become less responsive to insulin.BMore and more studies are done to study the link between sleep and weight.CMore than 20％ of Americans are not getting enough sleep.DFat cells are there to help us maintain a good health.
单选题According to the passage, which of the following is NOT TRUE?AThe Boston Tea Party took place in l773.BEuropeans figured out ways to use coffee during the 1670s.CDuring the l770s, more and more Americans began to drink coffee.DCoffee is a refreshing drink.
单选题According to the passage, which of the following statements is NOT true?ASmell is the most emotional of the senses.BSmell stimulates our memory more than the other senses.CSmell is considered to be mysterious, as it is untouchable.DSmell is the most difficult sense to identify.
单选题According to the passage, which of the following countries attracts more tourists than the others?AItalyBspainCFranceDGreece
单选题According to the passage, which of the following is NOT TRUE?AMost voters support the government's effort to help young people to work.BSome people protest against the government's attempt to force young people to work.CThere are more than one million young people who took part in the program.DThere are more than one million young people who are jobless.
单选题Which of the following statements is true ?ASwimming across the Channel takes less than four hours.BThe idea of a Channel tunnel or bridge is a very new one.CIt is considered to be more difficult to swim across the channel than any other means.DA tunnel or bridge would only reach as far as the coast.
单选题The author’s experiences during the childhood indicate all of the following EXCEPT that _____.Athe author is the first child of the familyBhis family led a very hard lifeChis mother gave less attention to himDhis mother treated him as more than an assistant
单选题Which of the following is the best title for the passage ?AA computer modelBStudies show ice melted equally in the North and the South during the ice ageCMost of the ice melted in the Northern hemisphere during the 30,000-year long ice ageDA survey result
单选题According to the passage, which of the following is true?APeople in allocations are unwilling to conform to a general pattern.BConformity is a special characteristic of business.CBusinessmen are all original thinkers.DBusinessmen are provided with greater opportunities than people in other professions.