How nervous we are ________ the coming high school entrance exams _______ June 15th!
A:thinking of ; on
B:to think of; on
C:thinking of ; in
D:to think of; in
正方形有____条对称轴,长方形有____条对称轴,圆有____条对称轴。
下列关于信息、能源和材料说法正确的是( )