—I like the photo I took on the beach yesterday. What do you think of it? —Well, really nice!
A:where
B:when
C:which
D:who
对食物中脂肪、蛋白质和糖类都能产生消化作用的是( )
下列溶液无色,在pH=1时能大量共存的是
购买包装食品时最好要选择( )