Molds cannot produce their own food ______ their nourishment from living on dead organic matter or on other living matter.

A．Get the university’s approval in advance.
B．Follow Susan’s advice about traveling abroad.
C．Take more French courses to improve his skills.
D．Make inquiries about the requirements for teaching chemistry.

A．Listen to the woman’s talk.
B．Study for a test.
C．Go to class.
D．Prepare his presentation.