. You don’t have to know the name of the author to find a book. You _________ find the book by the title.

A．must

B．need

C．can

D．would

下列是某些物品的近似pH，呈碱性的是

A．猕猴桃 pH=3.2

B．食用醋 pH=3.3

C．纯牛奶 pH=6.5

D．苏打水 pH=9.1