capital idea

A、(I) is true, (II) false.

B、(I) is false, (II) true.

C、Both are true.

D、Both are false.

The Fortune 500 isn't made for light reading. (8) ________ The 500 is based on U. S.-based compaflje5, publicly reported revenue, not on any quality-based metrics, You get high-grade companies such as Warren Buffett's Berkshire Hathaway (No. 7) nestled near utter dogs such as Fannie Mae (No. 5). (9) ________ My favorites:

LeBron who？ Last summer, Cleveland sustained a psychic trauma when basketball star LeBron James dumped the Cavaliers and went to Miami. Now the home of the Rock and Roll Hall of Fame has gotten a little mojo back by adding a company to the Fortune 500: Cliffs Natural Resources. (10)________It could have been better for Cleveland, though. The company used to be known as Cleveland-Cliffs Inc. but renamed itself in 2008, saying, "We're no longer only a North American iron ore player.”LeBron-Cliffs, anyone？

Chrysler returns. The automaker fell off the list 13 years ago, when it was acquired by Daimler-Benz (later DaimlerChrysler) in what proved to be one of the worst corporate deals ever, right up there with Time Warner (owner of Fortune's publisher) selling itself to AOL in 2001. Daimler dumped Chrysler onto the Cerberus leveraged-buyout firm, which put up almost nothing but still overpaid. (11) ________ It has no publicly traded stock. Under the terms of its federal bailout, however, it has to file financial reports with the SEC, so it's list-eligible again. Welcome back, No. 59.

Exit Unisys. Enter Cognizant. These two information technology firms are heading in opposite directions. (12) _______ But the company's revenue dropped in 2010, and this year it's fallen off the list, to No. 520. Meanwhile, Cognizant, on Fortune' s list of fastest-growing companies for a record eight straight years, has grown its way into the 500(No. 484) only three years after first making the Fortune 1,000. (13) ________ Unisys, by contrast, was formed in 1986 by combining old-line computer companies Burroughs and Sperry.

Finally, Buffett. His Berkshire Hathaway cracked the top 10 in revenue and profit for the first time because last year it bought the 78 percent of Burlington Northern that it didn't already own. (Buffett, a longtime director of The Washington Post Co.,steps down this month.)As part of that deal, Buffett split Berkshire Hathaway' s B shares 50 for 1.

(14) _________ So I decided it was time to sell half my Berkshire stake, held in an IRA, into the run-up. The stock's since risen 10 percent. Oh, well. Yet another example of why he's Warren Buffett and I write for a living.

Now match the statements (8-14) to the letter (A, B, C or D).

A Unisys was one of only 62 companies to have been in the 500 every year since Fortune started the list in 1955.

B Cliffs, which is heavy into iron ore pellets, coal and other industrial raw materials, doubled its revenue with the aid of acquisitions and leapt to No. 477 on this year's list from No. 750 last year.

C Cognizant, formed in 1994, is a creature of the offshoring world, with most of its development centers in India.

D I found some of this year's corporate comings and goings especially interesting.

E That got it listed on the S&P 500 index, forcing index investors to buy it and running up its price.

F Chrysler went broke and is now run by Fiat; it is owned primarily by Fiat and a trust for Chrysler workers and retirees.

G But if you leaf through the list at random, the way I used to leaf through the Book of Knowledge encyclopedia when I was a kid, you come across all sorts of stuff that's kind of fun.

The dot-com collapse may have been a disaster for Wall Street, but here in Silicon Valley, it was a blessing. It was the welcome end to an abnormal condition that very nearly destroyed the area in an overabundance of success. You see, the secret to the Valley's astounding multiple-decade boom is failure. Failure is what fuels and renews this place. Failure is the foundation for innovation.

The valley's business ecology depends on failure the same way the tree-covered hills around us depend on fire—it wipes out the old growth and creates space for new life. The valley has always been in danger of drowning in the unwelcome waste products of success—too many people, too expensive houses, too much traffic, too little office space and too much money chasing too few startups. Failure is the safety valve, the destructive renewing force that frees up people, ideas and capital and recombines them, creating new revolutions.

Consider how the Internet revolution came to be. After half a decade of start-up struggles, for example, hundreds of millions of Hollywood dollars were going up in smoke. It all seemed like a terrible waste, but no one noticed that the collapse left one very important byproduct, a community of laid-off C-H programmers who were now expert in multimedia design, and out on the street looking for the next big thing.

These media geeks were the pioneer of the dot-com revolution. They were the Web's business pioneers, applying their newfound media sensibilities to create one little company after another. Most of these start-ups failed, but even in failure they advanced the new medium of cyberspace. A few geeks, like Silicon Graphics founder Jim Clark, succeeded and utterly changed our lives. In 1994 Clark was unemployed after leaving the company be founded, doggedly trying to develop a new interactive-TV concept. He approached Marc Andreessen, the co-developer of Mosaic, the first widely used Internet browser, in hope of persuading Andreessen to help him design his new system. Instead, Andreessen opened Clark's eyes to the Web's potential. Clark promptly tossed his TV plans in the trash, and the two co-founded Netscape, the cornerstone of the consumer Web revolution.

Like the interactive-TV refugees and generations of innovators before them, the dot comers are already hatching new companies. Many are revisiting good ideas executed badly in the '90s, while others are striking out into entirely new spaces. This happy chaos is certain to mature into a new order likely to upset an establishment, as it delivers life-changing wonders to the rest of us. But this is just the start, for revolutions give birth to revolutions. So let's hope for more of Silicon Valley's successful failures.

What is implied in the first sentence?

A．The Silicon Valley blamed its failure on the success of Wall Street.

B．The Silicon Valley is also noted for its complex ecological web.

C．The Silicon Valley takes a vain pride in its overabundant successes.

D．The Silicon Valley would benefit from the collapse in certain ways.

A、paratenic host

B、intermediate host

C、definite host

D、reservoir host

A、train_test_split 能够将数据集划分为训练集、验证集和测试集

B、生成的训练集和测试集在赋值的时候可以调换位置，系统能够自动识别

C、train_test_split 每次的划分结果不同，无法解决

D、train_test_split 函数可以自行决定训练集和测试集的占比