阅读理解  It’s a plain common sense—the more happiness you feel, the less unhappiness you experience. It’s plain common sense, but it’s not true. Recent research reveals that happiness and unhappiness are not really two sides of the same emotion. They are two distinct feelings that, coexisting, rise and fall independently.

People might think that the higher a person’s level of unhappiness, the lower their level of happiness and vice versa. But when researchers measure people’s average levels of happiness and unhappiness, they often find little relationship between the two.

The recognition that feelings of happiness and unhappiness can co-exist much like love and hate in a close relationship may offer valuable clues on how to lead a happier life. It suggests, for example, that changing or avoiding things that make you miserable may well make you less miserable， but probably won’t make you any happier. That advice is backed up by an extraordinary series of studies which indicate that a genetic predisposition for unhappiness may run in certain families. On the other hand, researchers have found happiness doesn’t appear to be anyone’s heritage. The capacity for joy is a talent you develop largely for yourself.

Psychologists have settled on a working definition of the feeling—happiness is a sense of subjective well-being. They have also begun to find out who’s happy, who isn’t and why. To date, the research hasn’t found a simple formula for a happy life, but it has discovered some of the actions and attitudes that seem to bring people closer to that most desired of feelings.

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.

单选题 According to the text, it is true that _____
【正确答案】 A
【答案解析】首先根据第二段可知这两种情绪并不互相关联， 因此排除B。 根据最后一句话“You can increase your happiness through your own actions.”可知人们可以主动控制快乐情绪， 排除D。 又根据最后一段第一句“Why is unhappiness less influenced by environment?”可知消极情绪受外部因素的影响较小， 将这句话与第三段的“…unhappiness may run in certain families.”结合可排除D， 确定A正确。
单选题 The author argues that one can achieve happiness by _____.
【正确答案】 C
【答案解析】根据最后一段最后一句“You can increase your happiness through your own actions.”可知C正确。
单选题 The phrase “to date” (par.4) can be best replaced by _____.
【正确答案】 D
【答案解析】这个短语的后面用的全是现在完成时， 因此可推测它的意思为“到现在为止”。 until now截至目前。 as a result作为结果。 in addition此外。 at present现在。 因此选D。
单选题 What do you think the author believes about happiness and unhappiness?
【正确答案】 B
【答案解析】根据第一段最后一句“They are two distinct feelings that, coexisting, rise and fall independently.”可知这两种情绪截然不同， 并存但各自独立。 因此选B。
单选题 The sentence “that’s that” (par. 5) probably means: some people are born to be sad _____
【正确答案】 A
【答案解析】由于后文提到尽管基因会使人倾向于不快乐， 但人的主观因素可以决定性格， 因此这里应该是在反驳前文， 也就是本句的观点， 可以推测出本句的意思是“有些人生来就是悲伤的， 这就是事实了。 ”因此选A。