在平面斜坐标系xoy中$\angle xoy=45°$，点P的斜坐标定义为：“若$\overrightarrow{OP}=x_0\overrightarrow{e_1}+y_0\overrightarrow{e_2}$（其中$\overrightarrow{e_1},\overrightarrow{e_2}$分别为与斜坐标系的x轴，y轴同方向的单位向量），则点P的坐标为$\left(x_0,y_0\right)$”．若$F_1\left(-1,0\right),F_2\left(1,0\right)$且动点$M\left(x,y\right)$满足$\left|\overrightarrow{M{F}_1}\right|=\left|\overrightarrow{M{F}_2}\right|$，则点M在斜坐标系中的轨迹方程为（   ）

长期以来，中国古代“以士为尊，农工商卑”。而明清之际的江南地区出现了“天下之士多出于商”“豪杰有智略之人”也多致力于经商的现象。这反映了当时（    ）

离子态的无机盐（如血液中的H⁺、K⁺、Ca²⁺、H₂PO₄^-等）的生理作用不包括

用所给词的适当形式填空。
(1)What’s your____  (high)?
(2)The boys often go____ (swim) in that river in summer.
(3)Nobody ____ (like) his new look.
(4)Many young people want to be____  (sing).
(5)He wears____  (glass) every day. He thinks that’s very cool.