11. When it _____ air pollution, Beijing faces the three “C” s, car, coal and construction, which lead to Beijing’s heavy air pollution.
A. refers to B. happens to C. speaks to D. comes to
12. —Shall we go swimming or play badminton?
—_____. They are both good ideas.
A. It makes no difference to me B. That’s all right
C. Yes, I like them very much D. I’d prefer the former
