问题 填空题

表达式Len(Six(1.3))Mod2的值为______。

答案

参考答案:0

解析: 解本题的窍门有两点:①运算的先后顺序,这里应该是Str函数→Len函数→Mod(取模)计算;②Str函数和Len函数的功能,前者是将数字转为字符串,注意转换后数字前头会保留一空位表示正负。
表达式Len(Str(1.3))Mod2中1.3转换后为“_1.3”(“_”表示空格)。Len函数用来计算字符串的长度,“_1.3”长度为4(空格、小数点各算一个长度)。

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.

8()

A.dominantly

B.deliberately

C.accidentally

D.invariably

多项选择题