 who is the champion where semi-finalist #2 is na and location is morrisville, nc
CREATE TABLE "division_i" (
  "year" text,
  "champion" text,
  "score" text,
  "runner_up" text,
  "location" text,
  "semi_finalist_num1" text,
  "semi_finalist_num2" text
);
SELECT "champion" FROM "division_i" WHERE "semi_finalist_num2"='NA' AND "location"='Morrisville, NC';