第2题
Questions are based on the following passage.
It is a wise father that knows his own child, but today a man can boost his paternal (fatherly)wisdom —— or at least confirm that he"s the kid"s dad. All he needs to do is shell out $30 forpaternity testing kit (PTK) at his local drugstore —— and another $120 to get the results.
More than 60,000 people have purchased the PTKs since they first become availablewithout prescriptions last years, according to Doug Fogg, chief operating officer ofIdentigene, which makes the over-the-counter kits. More than two dozen companies sell DNAtests directly to the public, ranging in price from a few hundred dollars to more than $2,500.
Among the most popular: paternity and kinship testing, which adopted children can useto 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 businessesthat offer to search for a family"s geographic roots.
Most tests require collecting cells by webbing saliva (唾液) in the mouth and sending it tothe 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 bypeople claiming they are doing ancestry testing," says Trey Duster, a New York Universitysociologist. He notes that each individual has many ancestors —— numbering in the hundredsjust a few centuries back. Yet most ancestry testing only considers a single lineage (世系),either the Y chromosome (染色体) inherited through men in a father"s line or mitochondrial(线粒体) DNA, which is passed down only from mothers. This DNA can reveal geneticinformation about only one or two ancestors, even though, for example, just three generationsback 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 referencecollections to which a sample is compared. Databases used by some companies don"t relyon data collected systematically but rather lump together information from different researchprojects. This means that a DNA database may have a lot of data from some regions and notothers, so a person"s test results may differ depending on the company that processes theresults.
According to the passage, what is PTK used to? 查看材料
A.To locate one"s birth place.
B.To promote genetic research.
C.To find out if one is the father of a child.
D.To help improve one"s intelligence.
第4题
此题为判断题(对,错)。
第5题
下列词语中加横线的字读音全都正确的一组是()。
A.纰漏(pī)耳鬓(bìn)厮磨果脯(pú)锲(qì)而不舍
B.磋(cuō)商箪(sì)壶浆氛(fēn)围解(xiè)甲归田
C.角(jiǎo)色疾风劲(jìng)草停泊(bó)歃(shà)血为盟
D.不啻(chì)喟(kuì)然长叹墓碣(jié)钟灵毓(yù)秀 正确答案是B 解析 A项锲而不舍(qie,四声);C项角色(jue 二声);D不啻(chi 四声)
第6题
A.respecting
B.respective
C.respectful
D.respected
第7题
It CANNOT be inferred from the passage that______.
A.the department knows little respecting the science of global warming
B.the department is in the passive position in some cases
C.some social groups play significant roles in protecting environment
D.the department is reluctant to link heat-trapping gases with declining polar bear
第8题
A.It is a detailed plan to restart one's career.
B.It records one's work experience and capabilities.
C.It is the resume that applicants carry to employers.
D.It provides alternative choices for job seekers.
第9题
The author points out that one's style. of writing is ______.
A.inheritable
B.unteachable
C.unchangeable
D.learnable