单选题 English Test in Doctorial entrance examination is designed to observe the examinees' English ______in reading, writing, and translating.

【正确答案】 A

【答案解析】解析：本题考查形近词辨析。proficiency“专业度”，persistency“坚持性”，consistency“一致性”，sufficiency“充分性”。根据题干含义，填入proficiency是正确的。