Since then the number of people taking driving lessons ____20.

A．has increased to

B．increases by

C．has increased by

D．have increased by

茵陈采收季节不同，习称不同，秋季采收的茵陈习称

A．绵茵陈
B．茵陈蒿
C．幼茵陈
D．滨蒿
E．秋茵陈