下列运算中，正确的是（   ）

某校社团活动课中，手工制作社的同学用一种彩色硬纸板制作某种长方体小礼品的包装盒，每张硬纸板可制作盒身12个，或制作盒底18个，1个盒身与2个盒底配成一套，现有42张这种彩色硬纸板，要使盒身和盒底刚好配套，若设需用x张做盒身，则下面所列方程正确的是（   ）

①宗教要积极参与行政、司法、教育等国家职能的实施

②坚持宗教信仰自由，保护信教群众的物质利益和精神权益

③依法管理宗教事务，遵守国家的法律法规和方针政策

④宗教活动要服从和服务于国家的最高利益和民族的整体利益

    In the Charles E. Johnson Elementary School in New York, there is a special radio. It gives people warnings (警报) about bad weather.

    One day, there came a sound from the radio. This sound brought the piece of news: a heavy storm was coming. William Tomic, principal (校长) of the school, he asked teachers to bring children indoors and put them in a safe place at once.

    Minutes later, the storm came. However, because of the warning of the radio and the quick work of the principal, no one was hurt. “The radio really did work very well. 我们对它的工作感到很高兴,” William Tomic said. “The parents were as well.” The US government hopes there will be more such success stories. It plans to give this kind of radios to all 97, 000 public schools in the country.

    Every year, more than 10,000 big thunderstorms, 2,500 floods, 1,000 tomatoes (龙卷风) and some hurricanes (飓风) take place in the US, so the warning radios are very useful.

    They not only give people warnings about bad weather, but also give warnings about other dangerous things.