“It” in the last sentence refers to ______.

“It” in the last sentence refers to ______.
A、life expectancy
B、heart disease
C、modernity
D、cancer
【正确答案】：D
【题目解析】：事实细节题。倒数第二句话说的是癌症的排名仅次于心胀病，最后一句则是转折句，与前一句形成对比，显然说的也是癌症的排名，所以it指cancer，答案D正确。