题目内容：
根据以下材料，回答题Middle Age: A Low Point for Most
People around the globe hit the height of their misery and depression in middle 51_________ ., a new international study suggests. The finding by British and American researchers was based on an analysis of well-being among approximately 52_________ million people in 80 nations. With few exceptions,the observation appears to apply across the board, regardless 2 gender (性别) , culture,geography, wealth, job history, education, and marriage or parental status.
"The scientific fact seems to be that happiness and positive mental health follow a giant 'U' 53_________ through life," said study author Andrew J. Oswald, a professor of economics at Warwick University in Warwickshire, England. "For the average person, it's high when you're 20, and then it slowly 54_________ and bottoms out in your 40s. But the good news is that your 55_________ health picks up again, and eventually gets back to the high levels of your youth."
The finding was 56_________ on the pooling of several different sources of happiness data,including: two multi-decade happiness/satisfaction surveys (first launched in the 1970s), involving about 500,000 American and Western European men and women; four rounds of the 80-nation "World Values Survey" 57_________ between 1981 and 2004 in North America, Eastern and WesternEurope, Asia, Africa, Australia, and Central and South America; and a 2004-2007 survey 58_________ nearly 1 million Britons.
The bottom-line: For most people throughout the world, the highest probability for 59_________ striking is around 44 years of age.
In the United States, however, some as-yet unexplained 60_________ differences were observed, with happiness among men dipping the most in their early 50s, whereas women hit their nadir (最低点 ) around the age of 40.
The researchers cautioned that cheerful people tend to live longer than unhappy. 61_________ – a fact that might have skewed (使偏斜) the overall finding. But they also suggested that evidence of a happiness 62_________ might simply reflect a midlife choice to give up long-held but no longer tenable (守得住的) aspiration (志向), followed by a senior's sense of gratitude for having successfully endured 63_________ others did not.
"That said, some might find it helpful simply to understand the general 64_________ of mental health as they go through their own life," said Oswald. "It might be useful for people to realize that if they are 65_________ in their 40s this is normal. It is not exceptional. And just knowing this might help".
回答(51)题 A．age
B．place
C．height
D．degree
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