相关法中公式R=（Y-Y）/Syx可评价（）。

A.发育速度

B.发育匀称度

C.发育水平

D.发育趋势

E.以上都不是

—How do you like studying in the new school?

—Not so good.________, I miss my former classmates.[ ]

A. To be honest  

B. On the contrary

C. What's worse  

D. In general