题目

Maybe it is true that we do not know what we have got until we lose it，but it is also true that we do not know what we have been missing until it arrives. It takes an hour to like someone，and a day to love someone，but it takes a lifetime to forget someone. Giving someone all your love is never an assurance(保证)that they will love you back. Do not expect love in return；but if it does not，be content it has grown in yours. Do not rely on one's appearance；it can trick you. Do not rely on wealth；even that fades away. Rely on someone who makes you smile，because it takes 下列溶液中的Na+与50 mL 1 mol·L-1 Na3PO3溶液中Na+的物质的量浓度相等的是A．150 mL 3 mol·L-1 NaCl溶液 B．75 mL 2 mol·L-1 NaNO3溶液 C．150 mL 2 mol·L-1 Na2SO4溶液 D．75 mL 1 mol·L-1的Na2S溶液