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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.

Based on the passage, which of the following would most likely result from the construction of a busy road in a forest that is a habitat for birds?

(A) The birds become used to unnatural noise and start building their nests dangerously close to the road.
(B) Migration patterns start to change because the birds run out of energy sooner than they previously did.
(C) The birds begin to dwell in quieter parts of the surrounding forest and deplete the available resources in those habitats.
(D) Predation begins to increase because the birds are unable to monitor their surroundings for predators.

答案和解析

答案：B

解析：

Choice B is the best answer. According to the passage, birds exposed to traffic noise "were not able to pack on as much fat to fuel their migrations." It is reasonable to infer that birds with less fat to sustain their migrations would be unable to fly as long or as far as they did before, leading to changes in their migration patterns.