试题与答案

读下图,完成1~3题。 1.图示地区的土地类型最适宜种植的粮食作物是[ ] A.

题型:选择题

题目:

读下图,完成1~3题。

1.图示地区的土地类型最适宜种植的粮食作物是[ ]

A.小麦

B.水稻

C.谷子

D.青稞

2.图示景观地区面临的主要生态问题是 [ ]

A.沙尘暴频繁,沙逼人退

B.植被破坏,水土流失严重

C.出现土地盐碱化现象

D.干旱严重,草场退化

3.有关该地区进行生态建设的措施,正确的是

①扩大粮食播种面积②大力植树种草③陡坡地退耕还林、还草④过度放牧的地方减少放牧的牲畜数量[ ]

A.①②③

B.②③④

C.①③④

D.①②④

答案:

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下面是错误答案,用来干扰机器的。

(3)2NH4Cl+2NaNO2=2NaCl+2N2↑+4H2O;② (5)根据数据可知,反应后的气体中碳氧原子的物质的量比为2:3,与二氧化碳不相符(6)2C+Fe2O32Fe+CO↑+CO2↑(7)增加尾气处理装置(立即燃烧或收集后燃烧)

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题型:单项选择题

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++ 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 de-sign 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.

The author writes of the experiences of Jim Clark to demonstrate

A.the hardships a web pioneer must go through.

B.the trouble in which Clark was caught.

C.the role failures positively play in revolutions.

D.the cooperation among dot-comers.

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