第一节(共15小题；每小题2分，满分30分)
A
Mother Nature is a cruel mistress. Why? Read on to find the answer.
Venice
This iconic city is sinking rapidly. The canals that make up the streets of Venice rise 2mm every year, making relics of history go under the surface of water and destroying architecture. Experts warn that without intervention (干预), this city will disappear back into the water at an even faster rate, consumed by rising sea level from melting polar ice caps.
Machu Picchu
These Incan ruins have drawn adventurous tourists into the mountains of South America. The forces of natural erosion have been accelerated by tourism and this landmark faces severe influence from increasing foot traffic. The Peruvian government recently suggested a cable car that would cut out the
