Why is unhappiness less influenced by environment? When we are happy, we are more responsive to people and keep up connections better than when we are feeling sad. This doesn t mean, however, that some people are born to be sad and that s that. Genes may predispose one to unhappiness, but disposition can be influenced by personal choice. You can increase your happiness through your own actions.

　　1. According to the text, it is true that

　　[A] unhappiness is more inherited than affected by environment.

　　[B] happiness and unhappiness are mutually conditional.

　　[C] unhappiness is subject to external more than internal factors.

　　[D] happiness is an uncontrollable subjective feeling.

　　2. The author argues that one can achieve happiness by

　　[A] maintaining it at an average level.

　　[B] escaping miserable occurrences in life.

　　[C] pursuing it with one s painstaking effort.

　　[D] realizing its coexistence with unhappiness.

　　3. The phrase To date can be best replaced by

　　[A] As a result.[B] In addition.[C] At present.[D] Until now.

　　4. What do you think the author believes about happiness and unhappiness?

　　[A] One feels unhappy owing to his miserable origin.

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