Some of the problems that{{U}} (41)
{{/U}}people in the U.S.{{U}} (42) {{/U}}in the cities during old
days are still{{U}} (43) {{/U}}us -- poor planning, problems in{{U}}
(44) {{/U}}neighborhoods, and public transportation.
{{U}} (45) {{/U}}was a very important for city governments in the
last century,{{U}} (46) {{/U}}regard to water supplies, it was known
that water could be polluted,{{U}} (47) {{/U}}they didn't know{{U}}
(48) {{/U}}. Trying to get pure water was a big problem.
People like to talk about the{{U}} (49) {{/U}}old days, but
actually, the cities of the 19th century were dirty and,{{U}} (50)
{{/U}}, filthier than today.{{U}} (51) {{/U}}disease was a great{{U}}
(52) {{/U}}. There was still smallpox(天花) and also yellow fever and
malaria. The{{U}} (53) {{/U}}death rate was high, and there were other
dangers as well. {{U}} (54) {{/U}}true that people were
not being killed by cars.{{U}} (55) {{/U}}, they often were killed or
seriously{{U}} (56) {{/U}}by runaway horses. It was quite
common. Planning of cities and their{{U}} (57) {{/U}}was
controlled by{{U}} (58) {{/U}}speculators and real estate(不动产){{U}}
(59) {{/U}}who were only interested in{{U}} (60)
{{/U}}money.