关键词：考研英语阅读、示例分析、答案
考研英语阅读示例分析及答案：
【示例】
Once, the world's largest desert was thought to be the Sahara. However, recent geological studies have shown that the Sahara was not always a desert. It was once a lush green region, with rivers and lakes teeming with fish and wildlife. This dramatic change in climate and vegetation was caused by a shift in the Earth's orbit around the sun.
【分析】
本题主要考察考生对文章主旨和大意的能力。文章首先提到人们对撒哈拉沙漠的认识，然后转折指出撒哈拉并非一直为沙漠，而是曾经是一个绿洲。最后解释了这种气候变化和植被变化的原因。
【答案】
A. The Sahara was once a lush green region.
B. The Sahara's climate has changed significantly over time.
C. The Sahara has been a desert for a very long time.
D. The Sahara has always been a green region.
【正确答案】B
【软文广告】
还在为考研英语阅读而烦恼吗？【考研刷题通】小程序来帮您！政治、英语、数学等全部考研科目，海量真题、模拟题，随时随地刷题，助力您考研成功！快来下载体验吧！【考研刷题通】，考研路上的得力助手！