把假分数化成带分数或整数,带分数化成假分数 737=______;248=___

题型:解答题

问题:

把假分数化成带分数或整数,带分数化成假分数
7
3
7
=______;
24
8
=______;
39
7
=______.
考点:带分数,假分数和整数的互化
题型:解答题

在做“鱼鳍在游泳中的作用”的探究实验中,把鲫鱼的尾鳍和部分尾部用塑料板绑住,然后放入玻璃缸的水中,看到的现象最有可能是(  )

A.鲫鱼迅速下沉到水底

B.鲫鱼不能保持平衡,很快就侧翻在水中

C.鲫鱼游动速度减慢,转向不灵活

D.与其它鲫鱼比较,没有太大的变化

题型:解答题

某二叉树中有n个度为2的结点,则该二叉树中的叶子结点为______。

A.n+1

B.n-1

C.2n

D.n/2

题型:解答题

腭前神经出自()

A.腭前孔

B.腭大孔

C.腭小孔

D.蝶腭孔

E.眶下孔

题型:解答题

急性胃炎最常见类型是()

A.糜烂性

B.腐蚀性

C.单纯性

D.化脓性

E.萎缩性

题型:解答题

The richest man in America stepped to the podium and declared war on the nation’s school systems. High schools had become "obsolete" and were "limiting—even ruining—the lives of millions of Americans every year. " The situation had become "almost shameful. " Bill Gates, prep-school grad and college dropout, had come before the National Governors Association seeking converts to his plan to do something about it—a plan he would back with $ 2 billion of his own cash.

Gates’s speech, in February 2005, was a signature moment in what has become a decade-long campaign to improve test scores and graduation rates, waged by a loose alliance of wealthy CEOs who arrived with no particular background in education policy—a fact that has led critics to dismiss them as "the billionaire boys’ club. " Their bets on poor urban schools have been as big as their egos and their bank accounts.

Has this big money made the big impact that they—as well as teachers, administrators, parents, and students—hoped for The results, though mixed, are dispiriting proof that money alone can’t repair the desperate state of urban education. For all the millions spent on reforms, nine of the 10 school districts studied substantially trailed their state’s proficiency and graduation rates—often by 10 points or more. That’s not to say that the urban districts didn’t make gains.

The good news is many did improve and at a rate faster than their states’ 60 percent of the time—proof that the billionaires made some solid bets. But those spikes up weren’t enough to erase the deep gulf between poor, inner-city schools, where the big givers focused, and their suburban and rural counterparts. "A lot of things we do don’t work out," admitted Broad, a product of Detroit public schools and Michigan State who made a fortune in home building and financial services: "But we can take the criticism. "

The confidence that marked Gates’s landmark speech to the governors’ association in 2005 has given way to humility. The billionaires have not retreated. But they have retooled, and learned a valuable lesson about their limitations. "It’s so hard in this country to spread good practice. When we started funding, we hoped it would spread more readily," acknowledges Vicki Phillips, the director of K-12 education at the Bill & Melinda Gates Foundation. "What we learned is that the only things that spread well in school are kids’ viruses. "

The business titans entered the education arena convinced that America’s schools would benefit greatly from the tools of the boardroom. They sought to boost incentives for improving performance, deploy new technologies, and back innovators willing to shatter old orthodoxies. They pressed to close schools that were failing, and sought to launch new, smaller ones. They sent principals to boot camp. Battling the long-term worry that the best and brightest passed up the classroom for more lucrative professions, they opened their checkbooks to boost teacher pay. It was an impressive amount of industry. And in some places, it has worked out—but with unanticipated complications.

One of the important purposes of Bill Gates’ speech was to()

A. call on the rich people to sign contracts with schools

B. enlist the rich people’s effort to save failing schools

C. call on the governors to make proper education policies

D. call attention to the nation’s low test scores and graduation rates

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