出席全国政协十一届三次会议的全国政协某委员提出：“要把民族团结纳入国民教育全过程，贯穿青少年成长成才各阶段，不断增强他们对中 * * 大家庭的认同感和维护民族团结、反对民族分裂的责任感。”这是因为，维护民族团结是[ ]

①公民对国家、社会应承担的责任

②我国顺利进行社会主义现代化建设的根本保证

③公民根本的行为准则

④增强中 * * 凝聚力和综合国力的必然要求

A、①②③

B、②③④

C、①③④

D、①②④

More American people take their troubles with them on holiday, according to a new survey.    31         40 percent said that the main reason for going away is to escape   32          (press) from work, almost all said they worry more      33          they do at home. Only four in every one hundred said that they are happy and free of care.

The most common worry is burglary（入室盗窃）, with four out of ten worrying about their homes   34        (break) into while they are abroad. More than a quarter feel they will feel crazy   35     some other noisy and rough holiday-makers and twenty-two percent worry they may be attacked  36           their possessions will be  37            (miss).

The survey also showed   38         the stay-at-home Americans are no more. Three out of every five want to have a holiday abroad, which was          39    increase from the figures only three years ago. The hotel holiday is still a winner, with about one third of all Americans   40          (prefer) to go on a self-catering（自助） holiday.