香烟烟雾中含有CO、CO2、SO2、H2O等气体,用①无水CuSO4 ②澄清石灰水 ③红热CuO ④碱石灰 ⑤品红溶液 ⑥酸性KMnO4溶液等药品可将其一一检出,检测时香烟烟雾通入药品的正确顺序是( )
Charles was alone at home, with_______ looking after him.
It is often ______ that human beings are naturally equipped to speak.