—Do you know Yao Ming and Yi Jianlian?
—Yes, they are ____ basketball players from the NBA.
A:all
B:both
C:each
D:neither
读图,回答问题。
(甲:全世界 乙:发达国家 丙:中等收入国家 丁:低收入国家)
a-b=a+____.