题目

100mL 0.3mol/L Na2SO4溶液和50mL0.2mol/L Al2(SO4)3溶液混合后，溶液中SO离子的物质的量浓度(设体积为二者之和)为 A．0.2 mol/L           B．0.25 mol/L          C．0.4 mol/L         D．0.5 mol/L 答案：C动词填空1.How long __________the Green family_________(1ive)here? --For ten years.2.Look at the sign. You can't take photos here. --Sorry, I________(not see) it.3.Which team do you think _____________ ( win ) the football final tomorrow?I’m not so sure. Maybe Real Madrid CF is.4.While Tom with his parents _____________ ( chat ) in the sitting room yesterday, the bell rang.5.The life we were used to ____________ (change) since our grandfather died.6.Where’s Simon? He __________(write) a letter to his friend in the bedroom.7.This kind of bicycle _______________ (sell) well in our country.8.Boys and girls, _______(put) up the tent and then you can make a fire.