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TPO 6 听力Lecture第4篇 第4题
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题目
What started the runway effect that led to the Sahara area of North Africa becoming a desert?
the prevailing winds became stronger
the seasonal rains moved to a different area
the vegetation started to die off in large areas
the soil lost its ability to retain rainwater
题目解析
根据教授所说内容：What the Sahara experienced was uh … a sort of “runaway drying effect”. As I said the monsoon migrated itself, so there was less rain in the Sahara. 撒哈拉沙漠经历的变化，是一种“逃离干燥作用”。因为季候风会迁移，所以雨水也会随之迁移。所以引起“逃离作用”的首要原因是由于季风的迁移。选项 B 正确。
答案: B
答案: B
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