41．A．so                    B．although            C．but                           D．and

40．A．to                 B．in                           C．of                 D．for

39．A．not to use            B．to not use                C．don't use             D．to use

38．A．disagreement        B．support             C．policy                  D．treatment

37．A．Instead of              B．Instead             C．However              D．Except

36．A．get                 B．make              C．keep                    D．let

Beijing has more than 2.6 million cars．They make 3,600 tons of   45   each day．In 2006, the city stopped running 4,000 old polluting buses and 30,000 taxis．But more than 1,000 new cars go on the road each day．

Beijing had 238 "blue sky" days last year．A "blue sky day" is a day with good air quality．In 2005, the number   42    233．

However, a recent report suggests that Beijing had just 51 "blue sky" days in the first quarter this year．Much of the dust（灰尘）  43   the desert．But cars   44   most of Beijing's air pollution．

34．--How long has the weather been like this?

-- ________．

A．Until last night                                        B．Since last night

C．Two days ago                                        D．In two days