---If there are ______ people driving , there will be ______ air pollution.
--- Yes, the air will be fresher.

---If there are ______ people driving , there will be ______ air pollution.

--- Yes, the air will be fresher.

A．less; less          B．less; fewer         C．fewer; fewer       D．fewer; less

— If there are _____people driving, there will be ______air pollution.

— Yes, the air will be fresher.

A. less; less   B. less; fewer      C. fewer; fewer  D. fewer; less

— If there are _____people driving, there will be ______air pollution.
— Yes, the air will be fresher

1. A.
   less; less
2. B.
   less; fewer
3. C.
   fewer; fewer
4. D.
   fewer; less

---If there are ________people driving ,there will be _________air pollution.

---Yes, the air will be fresher.

A. less, less B. less, fewer　 　 C. fewer, fewer　 　　　 D. fewer, less