—Can you lend me the book Passing by Your World?
—Sorry. I returned it to the library just now. Maybe it is still ________.
A：available
B：possible
C：saleable
在与珠江三角洲地区形成“前店后厂”合作模式的过程中，港澳地区的优势条件有（ ）
已知a=5+3，b=25-3，则a与b的关系是（ ）
