held scientific dogma that had declared such a thing biologically impossible.
A decade later, scientists are starting to come to grips with just how different Dolly was. Dozens of animals have
been cloned since that first lamb_mice, cats, cows and, most recently, a dog—and it's becoming 39 clear that they
are all, in one way or another, defective.
It's 40 to think of clones as perfect carbon copies of the original. It turns out, though, that there are various degrees
of genetic 41 . That may come as a shock to people who have paid thousands of dollars to clone a pet cat only to
discover that the baby cat looks and behaves 42 liketheir beloved pet—with a different-color coat of fur, perhaps, or
a 43 different attitude toward its human hosts.
And these are just the obvious differences. Not only are clones 44 from the original template(模板) by time, but
they are also the product of an unnatural molecular mechanism that turns out not to be very good at making 45
copies. In fact, the process can embed small flaws in the genes of clones that scientists are only now discovering
注意:此部分试题请在答题卡 2上作答。
A.abstract F. identical K.overturning
B.completely. G. increasingly L. separated
C.deserted H.miniature M. surrounding
D. duplication I.Nothing N. systematically.
E. everything J. ordinary O. tempting
Section B
Directions: In this section, you are going to read a passage with ten statements attached to it. Each statement
contains information given in one of the paragraphs. Identify the paragraph from which the information is derived.
You may choose a paragraph more than once. Each paragraph is marked with a letter. Answer the questions by
marking the corresponding letter on Answer Sheet 2.
Should Single-Sex Education Be Eliminated?
A)Why is a neuroscientist here debating single-sex schooling? Honestly, I had no fixed ideas on the topic when I started
researching it for my book, Pink Brain, Blue Brain. But any discussion of gender differences in children inevitably
leads to this debate, so I felt compelled to dive into the research data on single-sex schooling. I read every study I
could, weighed the existing evidence, and ultimately concluded that single-sex education is not the answer to gender
gaps in achievement--or the best way forward for today's young people. After my book was published, I met several
developmental and cognitive psychologists whose work was addressing gender and education from different angles,
and we published a peer-reviewed Education Forum piece in Science magazine with the provocative title, "The
Pseudoscience of Single-Sex Education."
B)We showed that three lines of research used to justify single-sex schooling--educational, neuroscience, and social
psychology--all fail to support its alleged benefits, and so the widely-held view that gender separation is somehow
better for boys, girls, or both is nothing more than a myth.
The Research on Academic Outcomes.
C) First, we reviewed the extensive educational research that has compared academic outcomes in students attending
single-sex versus coeducational schools. The overwhelming conclusion when you put this enormous literature
together is that there is no clear academic advantage of sitting in all-female or all-male classes, in spite of much
popular belief to the contrary. I base this conclusion not on any individual study, but on large-scale and systematic
reviews of thousands of studies conducted in every major English-speaking country.
D)Of course, there’re many excellent single-sex schools out there, but as these careful research reviews have
demonstrated, it's not their single-sex composition that makes them excellent. It's all the other advantages that are
typically packed into such schools, such as financial resources, quality of the faculty, and pro-academic culture, along
with the family background and pre-selected ability of the students themselves that determine their outcomes.
E)A case in point is the study by Linda Sax at UCLA, who used data from a large national survey of college freshmen to
evaluate the effect of single-sex versus coeducational high schools. Commissioned by the National Coalition of Girls'
Schools, the raw findings look pretty good for the funders--higher SAT scores and a stronger academic orientation
among women who had attended all girls' high schools (men weren't studied). However, once the researchers
controlled for both student and school attributes--measures such as family income, parents' education, and school
resources--most of these effects were erased or diminished.