(单选题)
20.（ ）
A.theory
B.fact
C.challenge
D.goal
参考答案：D
参考解析：
考查名词辨析。句意：这个项目的目标是提高人们对痴呆症的认识。theory意为“理论”；fact意为“事实”；challenge意为“挑战”；goal意为“目标，目的”。根据不定式后面的内容可知，这里应该表示的是目的。故选D。
知识点：
(单选题)54.（ ）
(单选题)53.（ ）
(单选题)52. （ ）
(单选题)51.（ ）
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