题目内容
（请给出正确答案）
Skeptical observers believe that ancestry testing fails to ______.
A．trace distant ancestors
B．rebuild reliable bloodlines
C．fully use genetic information
D．achieve the claimed accuracy
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更多“Skeptical observers believe that ancestry testing fails to ______.A．trace distant ancestor”相关的问题
What is Skeptical observers' opinion on ancestry testing？
A．It fails to trace distant ancestors.
B．It rebuilds reliable bloodlines.
C．It contains fully genetic information.
D．It fails to achieve the claimed accuracy.
A．Of the three models of spatial curvature proposed by Einstein, only spherical geometry contradicts the Euclidean model.
B．The primary evidence for the notion is that that observers cannot see spatial flexure directly, but perceive it as gravitational attraction.
C．Space mapped on the spherical geometrical model may curve in one of three ways, as Einstein proposed.
D．Spheres typically contain only three dimensions, whereas most models of the universe attribute it at least four.
E．Scientists are skeptical, given that mass and energy quantities seem insufficient, yet ultimately do not know enough to dismiss the notion.
We all know that science plays an important role in the societies in which we live. Many people believe, however, that our progress depends on different aspects of science. The first of these is the application of the machines, products and systems of applied knowledge that scientists and technologists develop. Through technology, science improves the structure of society and helps man to gain increasing control over his environment.
The second aspect is the application by all members of society of the special methods of thought and action that scientists use in their work.
What are these special methods of thinking and acting？ First of all, it seems that a successful scientist is full of curiosity—he wants to find out how and why the universe works. He usually directs his attention towards problems which he notices have no satisfactory explanation, and his curiosity makes him look for underlining relationships even if the data available seem to be unconnected. Moreover, he thinks he can improve the existing conditions and enjoys trying to solve the problems which this involves.
He is a good observer, accurate, patient and objective and applies logical thought to the observations he makes. He utilizes the facts he observes to the fullest extent. For example, trained observers obtain a very large amount of information about a star mainly from the accurate analysis of the simple lines that appear in a spectrum.
He is skeptical—he does not accept statements which are not based on the most complete evidence available—and therefore rejects authority as the sole basis for truth. Scientists always check statements and make experiments carefully and objectively to verify them.
Furthermore, he is not only critical of the works of others, but also of his own, since he knows that man is the least reliable of scientific instruments and that a number of factors tends to disturb objective investigation.
Lastly, he is highly imaginative since he often has to look for relationships in data which are not only complex but also frequently incomplete. Furthermore, he needs imagination if he wants to make hypotheses of how processed work and how events take place.
These seem to be some of the ways in which a successful scientist or technologist thinks and acts.
Many people believe that science helps society to progress through ______.
A．applied knowledge.
B．more than one aspects.
C．technology only.
D．the use of machines.
More than 60,000 people have purchased the PTKs since they first become available without prescriptions last years, according to Doug Fog, chief operating officer of Identigene, which makes the over-the-counter kits. More than two dozen companies sell DNA tests Directly to the public , ranging in price from a few hundred dollars to more than $2500.
Among the most popular : paternity and kinship testing , which adopted children can use to find their biological relatives and latest rage a many passionate genealogists-and supports businesses that offer to search for a family’s geographic roots .
Most tests require collecting cells by webbing saliva in the mouth and sending it to the company for testing. All tests require a potential candidate with whom to compare DNA.
But some observers are skeptical, “There is a kind of false precision being hawked by people claiming they are doing ancestry testing,” says Trey Duster, a New York University sociologist. He notes that each individual has many ancestors-numbering in the hundreds just a few centuries back. Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father’s line or mitochondrial DNA, which a passed down only from mothers. This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other great-grandparents or, four generations back, 14 other great-great-grandparents.
Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared. Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects. This means that a DNA database may differ depending on the company that processes the results. In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.
26.In paragraphs 1 and 2 , the text shows PTK’s ___________.
[A]easy availability
[B]flexibility in pricing
[C] successful promotion
[D] popularity with households
More than 60,000 people have purchased the PTKs since they first became available without prescriptions last years, according to Doug Fogg, chief operating officer of Identigene, which makes the overthecounter kits. More than two dozen companies sell DNA tests directly to the public, ranging in price from a few hundred dollars to more than $2500.
Among the most popular : paternity and kinship testing , which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption. DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family’s geographic roots.
Most tests require collecting cells by swabbing saliva in the mouth and sending it to the company for testing. All tests require a potential candidate with whom to compare DNA．
But some observers are skeptical, “There is a kind of false precision being hawked by people claiming they are doing ancestry testing,” says Trey Duster, a New York University sociologist. He notes that each individual has many ancestors—numbering in the hundreds just a few centuries back. Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father’s line or mitochondrial DNA, which is passed down only from mothers. This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other greatgrandparents or, four generations back, 14 other greatgreatgrandparents.
Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared. Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects. This means that a DNA database may have a lot of data from some regions and not others, so a person’s test results may differ depending on the company that processes the results. In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.
第26题：In paragraphs 1 and 2 , the text shows PTK’s
A．easy availability.
B．flexibility in pricing.
C．successful promotion.
D．popularity with households.
The word skeptical is closest in meaning to ______.
A．free-thinking
B．cruel
C．doubting
D．incompetent
In Paragraph 1, the word "skeptical" means ______.
A．doubtful
B．worried
C．sad
D．angry
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