Please, could someone explain this code ?

Question

true = 1
false = 0

def get_questions():

return [["What color is the daytime sky on a clear day?","blue"],\
["What is the answer to life, the universe and everything?","42"],\
["What is a three letter word for mouse trap?","cat"]]

def check_question(question_and_answer):

question = question_and_answer[0]
answer = question_and_answer[1]

given_answer = raw_input(question)

if answer == given_answer:
print "Correct"
return true
else:
print "Incorrect, correct was:",answer
return false

def run_test(questions):
if len(questions) == 0:
print "No questions were given."

return
index = 0
right = 0
while index < len(questions):

if check_question(questions[index]):
right = right + 1

index = index + 1

print "You got ",right*100/len(questions),"% right out of",len(questions)

run_test(get_questions())

Answer 1

Which part don't you understand?

Answer 2

I don't understand why at the 2nd "def" in the ( ) it is written question_and_answer. Nonethless I think that is all a question about local and global variables. Please correct me if I'm wrong.