Nowadays, no single country can successfully ____ the global problems alone.

A．make use of

B．deal with

C．come up with

D．go through

正常情况下，红细胞直方图呈____，血小板直方图呈____，白细胞根据细胞形态大小及仪器型号不同呈现不同的曲线，一般是______峰态曲线。