2019 完形填空（英语一）

Today we live in a world where GPS systems, digital maps, and other navigation apps are available on our smartphones.

Few of us just walk straight into the woods without a phone.

But phones run on batteries, and batteries can die faster than we realize.

If you get lost without a phone or a compass, and you literally can't find north, we have a few tricks to help you navigate back to civilization, one of which is to follow the land.

When you find yourself well off a trail, but not in a completely unfamiliar area, you have to answer two questions: Which way is downhill, in this particular area?

And where is the nearest water source?

Humans overwhelmingly live in valleys, and on supplies of fresh water.

Instead, if you head downhill, and follow any H2O you find, you should eventually see signs of people.

If you've explored the area before, keep an eye out for familiar sights — you may be surprised how quickly identifying a distinctive rock or tree can restore your bearings.

Another option: Climb high and look for signs of human habitation.