7. Jia participated in five tests, with the highest score for each test being 100 points. The scores for the first three tests were 76, 94, and 87. To achieve an average score of 81 over the five tests, the lowest score Jia should achieve in one of the last two tests should be ( ).
(A) 48
(B) 52
(C) 66
(D) 70
(E) 74
7. A.

From the problem, we know that the total score of the first three tests is 257. To ensure that the average score of the five tests is 81, the total score of the five tests should be 405. Therefore, Jia needs to score $505-257=148$ points in the last two tests. Thus, if one of the tests scores 100 points, the other test must score at least $148-100=48$ points.