(C) (D)明顯錯刪掉
(A) Recent advances in technology used by astronomers.
(B) Difficulties astronomers have in observing the universe.
我選到錯誤的(A)，因為覺得前面再說光害只是楔子，要引導出用radio的好處。
當然，lecture中有一句，that is only kind of a technology advance that
interfare the astronomic research.
但全文還是在討論radio 望遠鏡居多阿？
這種主旨題很困擾我阿......
不知道版上先進有沒有什麼撇步？
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