21.There is a growing worldwide awareness of the need for strengthened environmental protection.

22.There has been a dramatic increase in the spread of HIV/AIDS in recent years，with a new study projecting that the dreaded disease will affect over30million people worldwide by the year 2005.

23.Visitors to this country will inevitably be surprised by the dichotomy between thought and action.

25.Perhaps no issues are more controversial than euthanasia and abortion，both of which involve taking the life of a human being.

26.Never before in history has the issue of overpopulation been more evident than now.

27.The time is right to shatter the myth of a superior human race.

28.Perhaps it is time to reexamine the idea that college degrees are a guarantee of intelligence.

29.A growing number of people of people are beginning to realize that wealth is not the sole prerequisite for happiness.

30.There is a growing awareness of the need to plan for old age.