You don't have to __________ every new word in the dictionary while reading.
A:look for
B:look up
C:look at
D:look after
糖类、蛋白质、脂肪必须经过消化后才能被人体吸收,脂肪被消化的器官、所需的酶、消化后的成分、吸收的器官分别是( )
下列物质性质与应用对应关系正确的是( )