My parents want me to take_________maths lessons at the weekend, but I want to play and have fun.

A．extra

B．available

C．former

D．recent

再障与下列哪项难鉴别

A．非白血性白血病
B．缺铁性贫血
C．脾功能亢进
D．PNH不发作型
E．巨幼细胞贫血