They are known as the Nazca lines and they 26 500 square kilometers.
答案：(C) cover
cover 500 square kilometers（涵蓋500平方公里）為固定搭配，表示納斯卡線的分布範圍達500平方公里；circle／contain／wrap 均不符合此處面積範圍的搭配語意。
cover 這個字，你的印象大概是「蓋住、覆蓋」（cover the pot），或是書的封面，不太會想到它可以用來講「占地多大面積」。
答對率不到五成。空格後面是 500 square kilometers（五百平方公里），一個面積。四個選項裡，能直接接一個面積數字、講「占地多大」的只有 cover。填進去讀成 they cover 500 square kilometers（這些線條占地五百平方公里）。cover 的兩個意思是接得起來的：先是「蓋住某個表面」，往抽象推一步就是「範圍涵蓋多大」——這一份考卷第 13 題的 covers the right temperature range（涵蓋正確的溫度範圍）用的也是這個抽象義，兩題可以擺在一起看。
circle（環繞成圈）講的是繞著某物轉，線條不會繞著一片面積轉；contain（容納、內含）的主詞要是容器或整體，後面接的是裡面的內容物，而不是面積；wrap（包裹）後面接的是被包起來的那樣東西。三個都是動詞原形，形態吻合，容易被順手選走。
cover ＋ 面積（占地、涵蓋）、square kilometers（平方公里）、contain（容納、內含）、wrap（包裹）、be cut into（被刻進、被切成）、the desert's surface（沙漠表面）。
In the desert of southwest Peru, enormous shapes, complex patterns, and thousands of perfectly straight lines are cut into the desert's surface. They are known as the Nazca lines and they 26 500 square kilometers. There are about fifty animal figures 27 275 meters long, including a monkey, a spider, and an "owl man." The last of these lines were drawn about 1,000 years ago.
More 28 is the fact that they can be viewed only from the air. Some people believe the Nazca Indians were 29 able to fly, perhaps in balloons. Others say the lines were landing areas for alien spaceships.
Maybe the lines were to carry water for farming, or were used as a calendar. The only thing certain is that the Nazca lines remain one of the world's most fascinating 30 mysteries.