they? The fact is that definitions vary. Everyone admits
for example, that Everest is a mountain, the lowest of __2__
them all, an altitude of almost 30,000 feet. But what about__3__
Snowdon, the loftiest peak in Wales? It raises a mere 3000__4__
feet, yet it is also called a mountain. Comparison—a little
matter of relativity—is the key. To the average person
living on North America's Great Plains, Vermont's Green
Mountains look lofty indeed, but to anyone from the Rocky
Mountains, the Green Mountains seem something more__5__
than hills. Geographers generally agree that, to be a mountain
topographically, a landmass might reach an altitude of 3000__6__
feet above the level of the sea. Mount Everest, for instance, is
30,000 feet above sea level, but not only 15,000 feet above the__7__
neighboring Tibetan plateau. Geologists restrict the definition
even more, maintaining that a mountain is a mountain with__8__
virtue of its geological structure. Some rugged highlands are
not really mountains, when some flat, low-lying rock surfaces__9__
are ture mountains. They are low now because of centuries of
erosion. There are even mountains under the sea—the
Mid-Atlantic Ridge, for example. Like all ture mountains,
they are originally formed by large-scale movements of the__10__
earth's crust.
答案：
1. elsewhere—everywhere
elsewhere意为“别处”
2. lowest—highest
3. an前加with
with在此处表示“具有......”相当于having
4. raise—rises
raise为及物动词，其后常带宾语；rise为不及物动词a mere 3000 feet在此处不是raise的宾语，而是状语
5. something—nothing
nothing此处为副词，修饰more。本句意义为“对生活在北美大平原地区的一般人而言，谓语Vermont州的Green Mountains看上去真的很高了，但对于任何一个来自Rocky Mountain地区的人而言，Green Mountain看上去不过是个山丘而已”。
6. might—must
作为一种标准必须达到某个高度
7. 删除only之前的not
否则文理不通
8. with—in或by
by/in virtue of：与“by reason of，because of ”同意
9. when—while
此处while与whereas同意，表示对照比较
10. are—were
originally formed 该动作是很早以前完成或结束的
