A．The man is an exceptional student and will write the exam for the class.
B．Circumstances will not permit the student to take the makeup exam.
C．The student’s request will be granted.
D．The student will probably not be able to complete the course.

A．Because people differ in their behavioral and physical characteristics.
B．Because human fingerprints provide unique information.
C．Because people’s behavior can be easily described in words.
D．Because human faces have complex features.