The school year is divided into two semesters, __________is September through December.

A．the first of which

B．the first of them

C．the first of it

D．the first of that

麻疹恢复期皮肤特点是( )

A．疹退后，留有色素斑痕，有麦麸样脱屑
B．疹退后，留有色素斑痕，有脱皮
C．疹退后，皮肤上不留色素斑痕，但有麦麸状脱屑
D．疹退后，不留有色素斑痕，但有脱皮
E．疹退后，无色素斑痕，无脱屑