读图,完成问题.
同纬度的A地海拔400米,B地海拔1900米,当B地气温是3℃时,则A地气温是( )
—What can I do for you, Madam?
—I'm looking for a table for eight, but I find they are all __________.
成书于东汉时期,总结春秋战国以来的数学成就的专著是( )