题目

短文填空根据下列短文内容，用下列动词的适当形武填空，必要的时候添加助动词。be, relax, mean, pay, lose, get, make, use, work Many people say that they too many hours. They don't have free time with their families. They can't take care of things at home. They don't have time . Work hours are different from one country to another. In France, people spend about 1,646 hours a year at work. In Japan, however, people work about 2,159 hours a year. That a Japanese worker works 513 more hours a year than a French worker. That is about 12 weekends of extra (额外的下列叙述正确的是①热稳定性：H2O>HF>H2S    ②熔点：Al>Na>K③ⅠA、ⅡA族元素的阳离子与同周期稀有气体元素的原子具有相同的核外电子排布④元素周期表中从ⅢB族到ⅡB族10个纵行的元素都是金属元素⑤元素的非金属性越强，其氧化物对应的水化物的酸性就越强⑥已知2H2(g)＋O2(g)=2H2O(l) △H=-571.6kJ·mol－1 则氢气的燃烧热为285.8kJ·mol－1⑦因为常温下白磷可自燃，而氮气须在放电时才与氧气反应，所以非金属性：P>NA．只有②④⑥    B．只有①⑥⑦   C．只有②③④    D．只有③⑤⑦