turn out aggressive happen to be those who spend more hours in child care.It also remains unclear whether reducing the amount of time in child care will reduce the risk that a child will turn into a mean person.What's more,quality child care is associated with increased skills in intellectual ability such as language and memory,leading some academics to suggest that child care turns out children who are \
The government-sponsored research,which has tracked more than 1,300 children at 10 sites across the country
since 1991,is bound to cause the debate over child care again: How should people balance work and family? And how should parents,especially mothers,resolve the demands that are placed on them to be both breadwinners and supermoms?
That debate was already on display at a new briefing yesterday,where researchers themselves had different
opinions about the data and its implications（含义）.\is a constant relationship between time in care and problem behavior,especially those involving aggression and behavior,\said Jay Belsky of Birkbeck College in London,one of the lead investigators of the study who has previously annoyed women's groups because of his criticisms of child care. \at the National Institute of Child Health and Human Development (NICHD) and one of the other lead scientists on the study. \
\
are other possibilities that can be entertained.Yet it is a quick solution-more hours in child care is associated with more problems.The easy solution is to cut the number of hours but that may have implications for the family that may not be beneficial for the development of the children in terms of economics.\Friedman said that asking parents to work fewer hours and spend more time with their children usually meant a loss of family income,which negatively affects children.
Scientists said that the study was highly reliable.But the researchers said they had no idea whether the
behavioral difficulties persisted as the children moved to higher grades. 24.Children who spend more time in quality child care will . A.develop greater ability in language B.be easy to manage and less naughty C.possess great risk-taking spirit D.be greedy and mean to their classmates 25.What is still unknown about higher level of aggressiveness in kindergarten children? A.Whether higher level of aggressiveness is related to child education. B.Whether longer child care equally affects children from different families. C.Whether aggressiveness is a direct result of longer child care.
D.Whether longer child care improves intellectual ability in children. 26.In the fifth paragraph the word \ . A.NICHD is unwilling to give parents recommendations B.NICHD is willing to give policy advice concerning child care C.the number of hours in child care should be reduced significantly D.parents should discipline the behavior of their children more strictly 27.According to Friedman,cutting the number of hours in child care . A.may prevent families from having the necessary financial sources B.will make families unable to enjoy much of the social benefits C.will result in subsequent behavioral difficulties in children
D.should be accompanied with the improvement in the quality of child care
C
A new study says that identity thieves may be able to use easily accessible information like your birthday and
hometown listed in commercial databases,public voter registration lists,and even on social networking websites and blogs to predict your Social Security Number (SSN).Two Carnegie Mellon University researchers found that an individual's date and place of birth were sometimes enough to guess his or her Social Security Number.
Alessandro Acquisti,an associate professor of information technology and public policy,and Ralph Gross,a
post-doctoral researcher,were able to predict,in a single attempt,the first five Social Security digits for 44 percent of departed individuals who were born after 1988 and for 7 percent of those born between 1973 and 1988.All 9 digits were identified correctly for 8.5 percent of individuals born after 1988 in fewer than 1.000 attempts. \you can successfully identify all nine digits of a Social Security Number in fewer than 10,000,or even 1,000 attempts,that Social Security Number is no more secure than a three-digit PIN,\
Social Security Numbers can be inferred because the Social Security Administration assigns numbers based in
part on geography.The Social Security Number's first three digits are issued based on the zip code of the mailing address provided on the Social Security application form.Since 1989,Social Security Numbers have been assigned shortly after birth,which makes younger American's Social Security Numbers even easier to figure out,according to Carnegie Mellon.Acquisti and Gross were able to more accurately predict the Social Security Numbers of Americans in smaller states and in more recent years of birth.
Being able to reason out even the first 5 digits of someone's Social Security Number makes identity theft easier.
Thieves could potentially use networks of computers to apply repeatedly for credit cards in another person's name
until hitting on the correct sequence（序列）of numbers or send out an e-mail to attempt to trick someone into revealing the last four digits of their Social Security Number.But the Social Security Administration says Americans should not be alarmed by this report. \is no foolproof method for predicting a person's Social Security Number,\says Mark Lassiter,a spokesman for the Social Security Administration. \method by which Social Security assigns Numbers has been a matter of public record for years.The suggestion that Mr Acquisti has cracked a code for predicting a Social Security Number is a dramatic exaggeration（夸张）.\
Acquisti says future Social Security Numbers could be made more secure by switching to a more randomized
assignment scheme.For reasons unrelated to this report,the Social Security Administration has been developing a system to randomly assign Social Security Numbers.The new numbering strategy will be conducted next year. 28.What is the text mainly about?
A.Methods of getting one's personal information. B.The importance of the Social Security Number. C.The safety of the Social Security Number. D.The assignment system of Social Security Number.
29.Whose Social Security Numbers have higher risks of being deduced? A.Individuals who were born after 1988.
B.Individuals who were born between 1973 and 1988. C.Individuals who were born after 1990 in small states.
D.Individuals whose numbers have been assigned shortly after birth. 30.Why is it possible to infer one's Social Security Numbers?
A.Because the number is closely related to one's birthday and hometown. B.Because the assignment system of the number is randomized. C.Because the Social Security Number is issued shortly after birth. D.Because the assignment of the number is related to one's register place. 31.It can be concluded from the text that . A.it is impossible for identity thieves to get one's last four digits of his SSN B.by knowing one's birth date and place,identity thieves can get one's 9 digits of SSN C.because of Acquisti's research,a more randomized assignment system has been developed D.a new system of assigning SSN is going to be carried out next year
D
Is any economist so dull as to criticise Christmas? At first glance,the holiday season in western economies
seems a treat for those concerned with such vagaries（奇想）as GDP growth.After all,everyone is spending;in America,retailers make 25% of their yearly sales and 60% of their profits between Thanksgiving and Christmas. Even so,economists find something to worry about in the nature of the purchases being made.
Much of the holiday spending is on gifts for others.At the simplest level,giving gifts involves the giver thinking
of something that the recipient would like-he tries to guess her preferences,as economists say-and then buying the gift and delivering it.Yet this guessing of preferences is not easy;indeed,it is often done badly.Every year,ties go unworn and books unread.And even if a gift is enjoyed,it may not be what the recipient would have bought if they had spent the money themselves.
Interested in this mismatch between wants and gifts,in 1993 Joel Waldfogel,then an economist at Yale
University,sought to estimate the difference in dollar terms.In a research,he asked students two questions at the end of a holiday season: first,estimate the total amount paid (by the givers) for all the holiday gifts you received; second,apart from the sentimental value of the items,if you did not have them,how much would you be willing to pay to get them? His results were gloomy: on average,a gift was valued by the recipient well below the price paid by the giver.
In addition,recipients may not know their own preferences very well.Some of the best gifts,after all,are
unexpected items that you would never have thought of buying,but which turn out to be especially well picked.And preference can change.So by giving a jazz CD,for example,the giver may be encouraging the recipient to enjoy something that was ignored before.This,a desire to build skills,is possibly the hope held by many parents who ignore their children's desires for video games and buy them books instead.
Finally,there are items that a recipient would like to receive but not purchase.If someone else buys them,
however,they can be enjoyed guilt-free.This might explain the high volume of chocolate that changes over the holidays.Thus,the lesson for gift-givers is that you should try hard to guess the preference of each person on your list and then choose a gift that will have a high sentimental value. 32.The word \ \
A.intelligent B.emotional C.social D.practical 33.According to the text,which of the following statements is TRUE? A.Price is nothing but the factor when you give gifts.
B.Chocolates will be blamed when people receive them as gifts. C.The receivers often overestimate the values of gifts.
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