These people assembled it by removing figures from the ruins of Cambodia's world-famous temples and replacing them with hollow, concrete 24.
答案：(D) fakes
fake 在此是名詞「仿製品、贗品」：這些人把真品移走，換上中空的混凝土仿製品；strategies（策略）、courses（課程、路線）、ways（方法）都無法被 hollow, concrete 修飾。
答對率 33%。
fake 你大概只認得形容詞「假的」（a fake watch），很少見到它直接當名詞用，意思是「贗品、仿製品」：The painting turned out to be a fake.（那幅畫結果是贗品）。
空格前面是 hollow, concrete（中空的、混凝土的）——能被「中空、混凝土」修飾的只能是實體的東西。strategies（策略）、courses（課程）、ways（方法）都是抽象概念，混凝土做不出來。看到形容詞很具體時，先問空格能不能被它形容，往往一步就篩掉大半。
For the most part, these are hard to distinguish from the originals.（這些大多難以與真品區分）——既然要與 originals（真品）對比，空格自然是「仿品」。
a fake（贗品、仿製品）、fake news（假新聞）、be hard to distinguish from（難以與…區分）、the original（真品、原作）。
The world's largest collection of Khmer sculpture resides at Angkor, the former royal capital of Cambodia. The 7,000 pieces—full statues, heads and carved inscriptions—are breathtaking not only for their individual beauty, but also for 21 they represent: a road map to the origins of much of Southeast Asian culture.
But the collection is not in a museum, and it is not open 22 visitors. It is held in unknown, guarded warehouses 23 only a few people can see it. These people assembled it by removing figures from the ruins of Cambodia's world-famous temples and replacing them with hollow, concrete 24. For the most part, these are hard to distinguish from the originals.
Clever art thieves? No, these "art thieves" work for the Angkor Conservancy. 25 very large pieces too heavy to move, virtually all surviving Angkorian statues, wood carvings and artifacts have been replaced with copies.