问题：
People who don"t smoke have less ______________ of suffering from lung disease than those who
smoke.
[ ]
A. potential
B. cause
C. hope
D. problem
People who don"t smoke have less ______________ of suffering from lung disease than those who
smoke.
B. cause
C. hope
D. problem
smoke.
[ ]
A. potential B. cause
C. hope
D. problem
参考答案：