请根据以下内容回答下列各题 It is known to us that English is not as old as Chinese, but
A.older than Chinese
B.as old as Chinese
C.not so old as Chinese
D.very hard to learn
A.older than Chinese
B.as old as Chinese
C.not so old as Chinese
D.very hard to learn
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.
请根据以下内容回答下列各题 Youth is not a matter of time but a matter of self-improvement, both physically and morally. Being a good youth, one should have those factors : the basic one is health. A healthy body is a kind of priceless treasure. One can do nothing without it. Secondly, we should pay essential attention to our moral character. We should be always willing to help those in trouble without any complaints. Moreover, we should care more about the people around us. Thirdly, cooperation and communication also play an important role in being a good youth. No one can live alone without any friends. And nobody can work out every problem without help of partners.So the youth should and must learn how to live and work well with others, including those people you don t like to cooperate or communicate with. The last but not the least, patriotism, meaning a love of one s country, is the one we should never forget. People always misunderstand the word "patriots" by thinking it only refers to those fighters who fight for their country. As a matter of fact, a patriot will do the things his country asks him to do. So being a youth is one thing, being a good one really needs to take every effort to make yourself to be. The passage really wants to tell us that__________
A.what the meaning of "patriots" is
B.the qualities a good youth should have
C.a youth should be doing good
D.one should help others
A.willingly
B.at his convemence
C.if he wants to
D.with complains
A.sometimes advertisements really sell what theconsumer needs
B.advertisements occasionally force consumers intobuying things they don t need
C.the buying motives of consumers are controlledby advertisements
D.fire insurance is seldom a worthwhile investment
A.how to make a wise buying decision
B.ways to protect the interests of the consumer
C.the positive and negative aspects of advertising
D.the function of advertisements in promotingsales
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