解一元二次方程：x2-2x-3=0．
∵x2-2x-3=0，
∴（x+1）（x-3）=0，
∴x+1=0或x-3=0，
∴x1=-1，x2=3．
——Is she _______________ in Geography?
——No, she isn’t. She shows no ______________ in this subject.
A．interesting; interested
B．interested; interested
C．interested; interest
D．interest; interesting
