下列溶液与20mL 1 mol·L^-1 NaNO₃溶液中NO₃^-物质的量浓度相等的是

2吨80千克=____千克

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Found

A set of keys. There is a toy bear on it, too.  If you lose it, call me at 880-1167313.  I'm from No. 2 Middle School.

                                                                                            Jack  Lost

An old bike.  It's black with a plastic(塑料的)basket.  Its seat is yellow.  If you find it, please return it to me.  I live in the fifth floor in Building 2.

    Miller   Lost

Yesterday, I lost a novel written by Mo Yan.  Its name is Frog.  I’m eager(渴望的)to find it.  If you find it somewhere, can you return it to me? I’m from Class 6, Grade 7.

                                               Louis