[单项选择]

In 1990 a report was published about what the earth might be like 20 years from then on. The report was a result of a three year（1）. According to the report, the picture of the earth in the year 2010 is not a （2）one. The world will be more（3）because the population will continue to grow. The population could be（4）6300 million, almost 2150 million more than in 1985. More people would move into cities, especially cities in（5）countries. Cities like Cairo and Jakarta probably would（6）have 15 million by then. Food production will（7）, but not enough to feed all the people. Farmers will grow 90% more food than they did in 1985,（8）most of the increase would be in countries that（9）produce enough food for their people. Little increase is（10）in South Asia, Africa and the Middle East. Poor farming ways are（11）large areas of crop land, changing farms into deserts. More farmland is（12）as cities become larger and more houses are built.（13）will get worse as industrial countries burn more coal and
A. settling
B. working out
C. answering
D. dealing