1.key takeaway
X is 200 times as old as Y -- CORRECT.
X is 200 years as old as Y -- WRONG.
X is 200 years older than Y--CORRECT
2.supposed修饰predecessors，表示推测可能是predecessors，
supposedly是副词不修饰predecessors，而是修饰Mediterranean，地中海地区的。
it is hoped 表客观，ETS prefer
hopefully 表主观，GMAT中一般为错误选项
hopefully meaning "i hope that/let's hope that". This is an informal expression, and is generally avoided in writing.
gravity waves 不会interact with matter，
B correct
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1.key takeaway
X is 200 times as old as Y -- CORRECT.
X is 200 years as old as Y -- WRONG.
X is 200 years older than Y--CORRECT
2.supposed修饰predecessors，表示推测可能是predecessors，
supposedly是副词不修饰predecessors，而是修饰Mediterranean，地中海地区的。