题目

It is already home to whales, seals and polar bears, but soon the Arctic (北极) must find __1__ for some Chinese visitors. A team of nine scientists will __2__ to the Arctic this month to mark the opening of China's __3__ Arctic scientific research station, SOA (the State Oceanic Administration (国家海洋局) has __4__. Construction of the station finished a while __5__, but operations were held __6__ during the polar night, __7__ normally runs from late October to the end of February. __8__this period, the sun never __9__ over the Arctic. And from mid-July to the end of August, the sun n14．写出下列化学反应的符号表达式（或化学方程式）和现象．（1）红磷在空气中燃烧：4P+5O2$\frac{\underline{\;点燃\;}}{\;}$2P2O5．现象：剧烈燃烧，放出热量，产生白烟．（2）在空气中加热铜片：2Cu+O2$\frac{\underline{\;\;△\;\;}}{\;}$2CuO．现象：红色固体变成黑色．（3）镁在空气中燃烧：2Mg+O2$\frac{\underline{\;点燃\;}}{\;}$2MgO．现象：剧烈燃烧，放出热量，发出耀眼的白光．（4）木炭在氧中燃烧：C+O2$\frac{\underline{\;点燃\;}}{\;}$CO2．现象：剧烈燃烧，放出热量，发出耀眼的白光．