建筑施工企业主要负责人必须（）考核合格，方可上岗。 A.安全知识和管理能力 B.安全

今年我市各校都不定期举行地震逃生演练活动。小明同学对此不以为然：又没发生地震，用得着那样练吗？他的看法[ ]

A．错误，因为这种演练有助于增强珍爱生命的意识

B．正确，因为人的生命独特性突出表现在与众不同

C．错误，因为这种演练是实现生命价值的唯一途径

D．正确，因为参加演练活动一定会使 学习成绩下降

南北走向的山峰，西坡上分布着高大树木，灌丛植物很少见。( )

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.

如果希望在ScrollPane中根据内容的大小自动出现滚动条，则应该（）。

A.vScroll=true

B.hScroll=true

C.hScroll=true并且vScroll=true

D.hScroll=自动并且vScroll=自动

砂仁的功效是（）

A.化湿行气，温中止呕，安胎

B.化湿，解暑，止呕

C.燥湿温中，除痰截疟

D.燥湿健脾，祛风湿

E.化湿行气，温中止呕