Which artist painted "Christina's World" (1948)?

After pilot Kenneth Arnold's 1947 sighting, which two-word term for an alien craft entered the language? Which 1947 film starred Cary Grant and Shirley Temple? King Michael abdicated in 1947 as monarch of which Eastern European nation? Which 1947 labor act made the closed-shop agreement illegal? Who directed and starred in the 1948 film "Hamlet"? Former vice president Henry Wallace ran for president in 1948 on which party's ticket? Which 1948 film includes the line usually misquoted as "We don't need no stinkin' badges"? Which 1948 classic of Italian neorealism follows a father and son searching Rome for the stolen vehicle he needs for hi…