The consumer price index tends to:（）

A. overstate the inflation rate, because its market basket is fixed and does not consider that consumers will substitute away from goods that have risen dramatically in price.

B. overstate the inflation rate because its market basket is variable and takes into consideration that consumers will substitute away from goods that have risen dramatically in price.

C. understate the inflation rate because its market basket is fixed and does not consider that consumers will substitute away from goods that have risen dramatically in price.

有关癌症肿块的特征，不正确的叙述是（）

A．表面高低不平

B．边界不清

C．早期出现疼痛

D．质地坚硬

E．固定、不活动