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请教大家 关于显微镜用的moss leaflet 样品
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请教大家 关于显微镜用的moss leaflet 样品# Biology - 生物学
x*s
1
之前用35K换了一张回国的机票,现在想改期,但最便宜的只剩下55K的票了,
有谁有AA里程票改期的经验?请问下,有没有可能免费找客服换票?
如果不行的话,只能多加20K换了,这20K必须是在原来换里程票的AA账户呢?还是随便
都行?
多谢
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s*n
2
September 11, 2010
Testing, the Chinese Way
By ELISABETH ROSENTHAL
When my children were 6 and 8, taking tests was as much a part of the rhythm
of their school day as tag at recess or listening to stories at circle time
. There were the “mad minute” math quizzes twice each week, with the
results elaborately graphed. There were regular spelling quizzes. Even today
I have my daughter’s minutely graded third-grade science exams, with
grades like 23/25 or A minus.
We were living in China, where their school blended a mostly Western
elementary school curriculum with the emphasis on discipline and testing
that typifies Asian educational styles. In Asia, such a march of tests for
young children was regarded as normal, and not evil or particularly anxiety
provoking. That made for some interesting culture clashes. I remember nearly
constant tension between the Asian parents, who wanted still more tests and
homework, and the Western parents, who were more concerned with whether
their kids were having fun — and wanted less.
I still have occasional nightmares about a miserable summer vacation spent
force-feeding flash cards into the brain of my 5-year-old son — who was
clearly not “ready” to read, but through herculean effort and tears,
learned anyway. Reading was simply a requirement for progressing from
kindergarten to first grade. How could he take tests and do worksheets if he
couldn’t read the questions?
But Andrew and Cara, now 16 and 18, have only the warmest memories of their
years at the International School of Beijing — they mostly didn’t
understand that they were being “tested.” As educators and parents in the
United States debate new federal programs that will probably expose young
children to far more exams and quizzes than is the current norm, I think
often of the ups and downs of my children’s elementary education. What
makes a test feel like an interesting challenge rather than an anxiety-
provoking assault?
Testing of young children had been out of favor for decades among early-
childhood educators in the United States, who worry that it stifles
creativity and harms self-esteem, and does not accurately reflect the style
and irregular pace of children’s learning anyway. (There may be some truth
to that. My son, who suffered the flash card assault, was by age 7 the
family’s most voracious reader.) Testing young children has been so out of
favor that even the test-based No Child Left Behind law doesn’t start
testing students’ reading abilities until after third grade — at which
point, some educators believe, it is too late to remedy deficiencies.
But recently, American education’s “no test” philosophy for young
children has been coming under assault, as government programs strongly
promote the practice.
First there was No Child Left Behind, which took effect in 2003 and required
states to give all students standardized tests to measure school progress.
Now, President Obama’s Race to the Top educational competition — which
announced billions of dollars in state grants this month — includes and
encourages more reliance on what educators call “formative tests” or “
formative assessments.” These are not the big once-a-year or once-in-a-
lifetime exams, like the SATs, but a stream of smaller, less monumental
tests, designed in theory, at least, primarily to help students and their
teachers know how they’re doing.
Some education experts hail the change as a step forward from the
ideological dark ages. “Research has long shown that more frequent testing
is beneficial to kids, but educators have resisted this finding,” said
Gregory J. Cizek, a professor of educational measurement and evaluation at
the University of North Carolina at Chapel Hill.
Of course, the tests have to be age-appropriate, Professor Cizek notes, and
the Race to the Top program includes funds for research to develop new exams
. Filling in three pages of multiple-choice bubbles may not be appropriate
for young children. Likewise “high stakes” tests — like the Chinese
university entrance exam, which alone determines university placement —
create anxiety and may unfairly derail a youngster’s future based on poor
performance on a single day.
But Professor Cizek, who started his career as a second-grade teacher, said
the prevailing philosophy of offering young children unconditional praise
and support was probably not the best prescription for successful education.
“What’s best for kids is frequent testing, where even if they do badly,
they can get help and improve and have the satisfaction of doing better,”
he said. “Kids don’t get self-esteem by people just telling them they are
wonderful.”
Other educators recoil at the thought of more tests. “The Obama
administration is using the power of the purse to compel states to add more
destructive testing,” said Alfie Kohn, author of “The Case Against
Standardized Testing” and many other books on education. “With Race to the
Top the bad news has gotten worse, with a relentless regimen that turns
schools into test prep courses.”
He said genuine learning in young children was a global process, while tests
look at narrow and specific skills, and good teachers don’t need tests to
know if a child is learning. He added that for young children, good test
results were more a function of whether children can sit still or hold a
pencil. “These tests are being added in the name of accountability despite
the objections of early-childhood educators who say they have no place in
the classrooms,” he said.
Rather than a “low-stress tool to identify gaps in the learning process,”
he added, “they are used as a club to punish students who need help.”
I will not pretend that raising children amid a stream of tests is a Zen
experience, for them or for their parents. In Beijing, both of my children
had subjects or grades in which they performed poorly. There was an entire
elementary school year in which my son got consistently mediocre grades in
math, in English, in everything, it seemed. It took endless parental
cheerleading to maintain his self-esteem. And there were times when — yes
— I’m sure he felt bad about himself.
But let’s face it, life is filled with all kinds of tests — some you ace
and some you flunk — so at some point you have to get used to it. “Schools
do a lot of nurturing and facilitating, and then it’s a bit of a shock for
children when they have to sit at a desk all alone and be tested,”
Professor Cizek said.
When testing is commonplace and the teachers are supportive — as my
children’s were, for the most part — the tests felt like so many puzzles;
not so much a judgment on your being, but an interesting challenge. It is a
testament to the International School of Beijing — or to the malleability
of childhood memory — that Andrew now says he did not realize that he was
being tested. Will tests be like that in a national program, like Race to
the Top?
When we moved back to New York City, my children, then 9 and 11, started at
a progressive school with no real tests, no grades, not even auditions for
the annual school musical. They didn’t last long. It turned out they had
come to like the feedback of testing.
“How do I know if I get what’s going on in math class?” my daughter asked
with obvious discomfort after a month. Primed with Beijing test-taking
experience, they each soon tested into New York City’s academic public
schools — where they have had tests aplenty and (probably not surprisingly)
a high proportion of Asian classmates.
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l*n
3
买了mywi 5.5,结果不能用。只好上了pdanet。浪费20刀。
JB的同修们不要急着买MyWI!!!
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q*j
4
每个店平均每天几十个,30万库存慢慢放完。既长人品,又赚流量。
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i*o
5
大家好 我是做显微成像的 最近老板让我用我搭得显微镜看一些植物的样品 我只知道
fluorescent beads可以再invitrogen买 但是植物的 像中学显微镜看过的那些样品应
该从哪里买呢?类似以下link:
http://www.bio.umass.edu/biology/research/gbi/moss-leaflet-cell
请指教,谢谢!
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b*8
6
必须原来的账户,如果要加20k的话
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i*e
7
谁给中文总结一下?
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h*y
8
为啥我用着好好的。。
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q*g
9
嗯。最后一批放到black friday
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s*n
11
摘要就是美国人小孩小时候在中国受应试教育尝到甜头了,回美国来不适应了,直到又
投入一亚裔成堆考试不断的学校
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m*s
12
in store only...
网站还不怕死
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i*o
13
thank you very much!
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g*9
14
上海开了不少专们培训SAT的班,据说不少小孩专门从美国飞回去补课,或干脆回国一
年上国际学校。

【在 s******n 的大作中提到】
: 摘要就是美国人小孩小时候在中国受应试教育尝到甜头了,回美国来不适应了,直到又
: 投入一亚裔成堆考试不断的学校

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r*d
15
美国政府从布什开始就推动教改,可是现总统才强推更多的经常性的考试;研究也支持
更多的考试是有利的,但是习惯了没有考试的教育工作者不同意。据说这些考试对于孩
子来说习惯了就好,回忆起来还挺有趣的(两个在北京上国际学校的美国小孩的经历)。
上面这个跟中国政府大力提倡的素质教育基本相反(中国的老师好像也不习惯没有考试
的日子吧),两国政府的主张放一起看似乎是从两头往中间靠。我们老祖宗的中庸啊。
从我个人的经历来说,我更希望有潜力的孩子在各个年纪能得到足够的教育培养机会,
兴趣得到很好的引导,我认为这点美国的教育系统好得多;如果孩子资质一般,毫无疑
问美国的系统也对孩子好得多。
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s*n
16
分数不重要是骗很傻很天真的,
SAT,GPA,MCAT,GRE,GMAT,USMLE,BAR TEST哪一个分数不重要
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l*r
17
你这个帖文的劲头,让我想起道长来了。
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