[填空题]Non-theorists in science do their research ______.

[简答题] As social science research data and government surveys increasingly show, the decline in marriage since the 1960s has been (47)______ by a rise in a number of serious social problems. Children born (48)______ or whose parents divorce are much more likely to experience poverty, abuse, and behavioral and emotional problems, have lower academic achievement, and use drugs more often. Single mothers are much more likely to be victims of (49)______ violence. With the rise in these problems comes high program costs to deal with the effects of the (50)______ of marriage. For children whose parents remain married, however, the benefits are real. (51)______ from these families have been found to have better health and are less likely to be depressed, are less likely to (52)______ a grade in school, and have fewer developmental problems. The (53)______ of such mounting evidence for social policy are immense. Too many welfare programs continue to undermine marriage among the poor and must