— The owner of the small shop fought to stop the big corporation from knocking it down.
— Yes, and he finally made it. It was indeed __________.
A:a catch-22 situation
B:a Pandora's box
C:a David and Goliath battle
D:a Jekyll and Hyde existence
甲数是乙数的4倍,甲数和乙数的比是____,乙数和甲乙两数和的比是____。
-- Not often, twice a month.