# SAT官方每日一题附答案和解析[阅读](2019年6月5日)

Building a road through wilderness certainly has a visible impact on local flora and fauna -- you're physically paving over a slice of what was once habitat. But roads have less obvious effects, too. Like the introduction of traffic noise, which also takes a toll. "You can see an oil spill but you can't see a traffic noise spill. So convincing people that it's important is a little more difficult," said Heidi Ware.

Ware is an ornithologist at the Intermountain Bird Observatory in Boise, Idaho. She and her colleagues studied the reactions by birds to the sounds of vehicles. And they did it without paving the great outdoors. Instead, they mounted 15 pairs of speakers on Douglas fir trees, along a ridge near Boise, and played traffic noise. They thus created what they call a "phantom road" through the wilderness, which boosted local noise levels 10 decibels higher than those in the surrounding forest.

Turns out just the sounds of traffic scared away a third of the area's usual avian visitors, and cut species diversity too. And birds of multiple species were not able to pack on as much fat to fuel their migrations, when they were forced to dine to the soundtrack of traffic.

Follow-up experiments in the lab found that, when it's noisy, birds spend a lot less time head down, pecking at food, and a lot more time scanning their surroundings.

Ware says Yosemite, Glacier and Rocky Mountain National Parks all have roads that are busy enough to produce these effects. And, short of closing park roads to traffic, she says things like rubberized asphalt and lower speed limits could help cut the noise. "Glacier National Park is going to put up signs, that instead of showing your speed and preventing people from speeding, it's going to show how loud their car is on the road." Which, hopefully, will continue to encourage wilderness lovers to leave no trace -- visible or audible.

The underlined word “encourage” most nearly means ________

(A) cultivate.
(B) stimulate.
(C) reassure.
(D) strengthen.

 重点单词 查看全部解释 diversity [dai'və:siti] 想一想再看 n. 差异，多样性，分集 联想记忆 slice [slais] 想一想再看 n. 薄片，切片vt. 切成薄片，削 obvious ['ɔbviəs] 想一想再看 adj. 明显的，显然的 联想记忆 context ['kɔntekst] 想一想再看 n. 上下文，环境，背景 联想记忆 cultivate ['kʌltiveit] 想一想再看 vt. 培养，耕作，栽培，结交(朋友), 促进增长，教养 联想记忆 encourage [in'kʌridʒ] 想一想再看 vt. 鼓励，促进，支持 联想记忆 multiple ['mʌltipl] 想一想再看 adj. 许多，多种多样的n. 倍数，并联 联想记忆 produce [prə'dju:s] 想一想再看 n. 产品，农作物vt. 生产，提出，引起， 联想记忆 audible ['ɔ:dəbl] 想一想再看 adj. 听得见的 联想记忆 glacier ['glæsjə] 想一想再看 n. 冰河，冰川 联想记忆
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