A:occupied i
B:busy for
C:absorbed to
D:engaged to
草地上、树桩上有时会长出蘑菇,主要是因为草地和树桩可以为蘑菇生长提供( )
完成下列探究与实验
人体内环境中,与组织液成分最接近的液体是( )
— What can I do for you, madam?
—I want some cakes my parents.