UNIT 7 TEST 2A. IF HER PARENTS HAD INSISTED B. WERE HER PARENTS NOT IN...

45. It has been forecast that, by the middle of the twenty-first century _____.(38) ______. Mexico City has pad air. It is dirty and (39) ______. Cars are onea. various measures will have been taken to encourage population growthreason for the dirty air. Many Mexicans now own their own cars and drive in thecity. The factories in the area also cause air pollution. These factories put a lot ofb. the world population will be stabilized at around 10 to 15 billionc. the population growth rate in less developed countries will be much (40) ______ into the air. It is not easy to clean up the air in a large city. Thehighergovernment has to make new laws, and everyone has to help.d. the rate of population increase will have doubled the 1950 rate