The dormitory is ______.

A．examinations exert a pernicious influence on education
B．examinations are ineffective
C．examinations are profitable for institutions
D．examinations are a burden on students

A．describing how the principles of classical chemistry were developed
B．initiating a debate about the kinds of chemical reaction required for the development of life
C．explaining how current research in chemistry may be related to broader biological concerns
D．clarifying inherent ambiguities in the laws of classical chemistry