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光合潜力

答案

参考答案：

在其它自然条件（环境因素）都处于适宜条件（其中包括土壤湿度约为田间持水量的70%，CO2浓度为0.03%），当地的光合产量可能达到的最高值。

单项选择题

在表单设计阶段，下列说法不正确的是( )。

A) 拖动表单上的对象，可以改变该对象在表单上的位置
B) 拖动表单上对象的边框，可以改变该对象的大小
C) 通过设置表单上对象的属性，可以改变对象的大小和位置
D) 表单上的对象一旦建立，其位置和大小均不能改变
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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.

6（）

A.precisely

B.extraordinarily

C.exceedingly

D.extremely
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