nieyuhang

Q8 选C,不选E的理由在，plate tectonics已经能够完全解释himalayas的成因的。看原句在 Himalayan Mountains 之后的however是在说其他有些地质现象不能用板块学说来解释，比如说superswell.Scientists  ... producing the Himalayan
    Mountains. However, plate tectonics cannot fully explain certain massive surface features, such as the “superswell” of southern Africa
Q9 选D,
D & E是很相似，关键要找出两个选项的差异点D.
They have convinced formerly skeptical researchers that rock formations deep in Earth’s mantle below southern Africa could have created the superswell.

E.
They have confirmed researchers’ speculation that masses of hot rock are buoyant enough to rise to the upper part of Earth’s mantle.

两个选项的前半句，都挺好的，E似乎还更客观点;所以我们要比较后面，E选项这样就出现问题了。原文最后一句明显说了这个formation的两个特点

1. buoyant enough to rise, 2. strong enough to push

E only covers the 1 point. and it leaves D the best answer.