A、All taxis began to use meters. B、All taxis got air conditioning. C、Advertisements were allowed on taxis. D、Old taxis were repl

　　Cairo is known for its overcrowded roads, irregular driving practices and shaky old vehicles, but also for its air pollution. In recent months, though, environmental studies indicate there have been signs of improvement. (5) That’s due in part to the removal of many of the capital’s old-fashioned black and white taxis. Most of these dated back to the 1960s and 70s and were in a poor state of repair.
　　(6) After new legislation demanded their removal from the roads, a low interest loan scheme was set up with three Egyptian banks so drivers could buy new cars. The government pays about $ 900 for old ones to be discarded and advertising on the new vehicles helps cover repayments.
　　The idea has proved popular with customers—they can now travel in air-conditioned comfort and (7) because the new cabs are metered, they don’t have to argue over fares. Banks and car manufacturers are glad for the extra business in tough economic times. As for the taxi drivers, most are delighted to be behind the wheel of new cars, although there have been a few complaints about switching from black and white to a plain white colour.
　　5. What change took place in Cairo recently?
　　6. What helped bring about the change?
　　7.  Why do customers no longer argue with new cab drivers?