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问题 单项选择题

以下关于64位操作系统的叙述，错误的是______。

A．64位操作系统非常适合应用于CAD/CAM、数字内容创建、科学计算甚至严格的财务分析领域
B．64位操作系统要求主机具有64位处理器和64位系统驱动程序
C．64位操作系统可以运行32位系统软件，也可以运行64位系统软件
D．32位操作系统最高支持4GB内存，而64位操作系统可以支持最大512GB容量内存

答案

参考答案：D

选择题

在数轴上和表示-3的点的距离等于5的点所表示的数是（　　）

A．-8

B．2

C．-8和2

D．1
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单项选择题

Even plants can run a fever, especially when they are under attack by insects or disease. But (1) humans, plants can have their temperature (2) from 3,000 feet away—straight up. A decade ago, (3) the infrared scanning technology developed for military purpose and other satellites, physicist Stephen Paley (4) a quick way to take the temperature of crops to determine (5) ones are under stress. The goal was to let farmer (6) target pesticide spraying (7) rain poison on a whole field, which (8) include plants that don’t have the pest problem.

Even better, Paley’s Remote Scanning Services Company could detect crop problem before they became (9) to the eye. Mounted on a plane flown at 3,000 feet (10) , an infrared scanner measured the heat emitted by crops. The data were (11) into a color-coded map showing (12) plants were running "fevers". Farmers could then spot spray, using 50 to 70 percent less pesticide than they (13) would.

The bad news is that Paley’s company closed down in 1984, after only three years. Farmers (14) the new technology and long-term backers were hard (15) . But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to (16) into operation. Agriculture experts have no doubt about the technology works. "This technique can be used (17) 75 percent of agricultural land in the United States," says George Oerther of Texas A＆M. Ray Jackson, who recently retired from the Department of Agriculture, thinks (18) infrared crop scanning could be adopted by the end of the decade. But (19) Paley finds the financial backing (20) he failed to obtain 10 years ago.

17（）

A.of

B.in

C.for

D.on
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