单项选择题
根据以下材料，回答56-60题
Most people want to work，but it has become more difficult in today’s world to find work for everyone.The economy （经济）of the world needs to grow by 4%each year just to keep the old number of jobs for people.Often this is not possible，and so more people are out of work.Some peo-ple have no jobs now because new machines can do the work of many people in short time.Also，machines do not ask for more money and longer holiday.In all of the countries of the world，ma-chines are taking work from people，not only in factories but also on the farms.One machine can of-ten do the work from forty people.About 75，000people are moving to the cities a day to look for jobs，but only 70%of them can find jobs.
A.70% of the people
B.4% of the people in the world
C.More than 75000
D.About 75000 people