SAT grammar THanks!Numerous illness that were once difficult to -_英语解答

SAT grammar THanks!
Numerous illness that were once difficult to ----- may now be diagnosed through -----blood tests.
A.detect.perfunctory
B.facilitate ...tedious
C.administer...pre-emptive
D.treat.grueling
E.observe.inconvenient
The answer is But why?Isn't PERFUNCTORY a negative word?

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解答

第一个空我们可以排除掉B、C、D答案,曾经好些疾病难以（诊断、检测）出来,而相近的D答案中的”treat“是”治疗,整个句子没有讲到治疗的内容,还处于检测阶段.第二个空我们可以通过“may”以及句意来判断,因为句子意思...