单项选择题

According to the passage, many Third World countries ______.

A．haven't attached much importance to birth control
B．would soon join Brazil in controlling their birth rate
C．haven't yet found an effective measure to control their population
D．neglected the role of TV plays in family planning

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单项选择题

The concept of personal choice concerning health is important because ______.

A．personal health choices help cure most illnesses
B．it helps raise the level of our medical knowledge
C．it is essential to personal freedom in American society
D．wrong decisions could lead to poor health

单项选择题

Sound personal health choice is often difficult to make because ______.

A．current medical knowledge is still insufficient
B．there are many factors influencing our decisions
C．few people are willing to trade the quality of life for the quantity of life
D．people are usually influenced by the behavior of their friends