A:nineteen and ninety-nine
B:nineteen ninety-nine
C:one thousand nine hundred ninety-nine
D:nineteen hundred and ninety-nine
—When _________ you have a book sale?
—Sorry, I _________ know.
若1个豌豆的豆葵(果实)中有5颗种子,对该果实的发育分析正确的是( )