“儿不嫌母丑，狗不嫌家贫”，是中国的一句古语。自己的家境可能不如别人富裕，父母的

下列离子方程式正确的是

A．过量乙酸与碳酸钠溶液反应：2H⁺＋CO== CO₂↑＋ H₂O

B．溴乙烷在NaOH水溶液中加热： CH₃CH₂Br + NaOH →CH₂=CH₂↑+NaBr + H₂O

C．苯酚钠溶液中通入少量二氧化碳：2C₆H₅O^－＋CO₂＋H₂O2C₆H₅OH＋CO

D．甲醛溶液与足量的银氨溶液共热：HCHO+4[Ag(NH₃)₂]⁺+4OH^-CO+2NH+4Ag↓+6NH₃+2H₂O

A certain prosthodontist specializes in implanting gold and silver teeth in his patients’ mouths. He charges $650 for a gold tooth and $325 for a silver tooth. If his total fees for implanting gold and silver teeth last week were $15,925 in total, and he implanted five more gold teeth than silver teeth, how many teeth in total did he implant over the week ？（）

A. 31

B. 32

C. 33

D. 34

E. 35

人工砂是天然岩石经人工破碎筛分而形成的粒径( )的岩石颗粒。

A．小于4.75mm

B．大于4.75mm

C．小于5mm

D．大于5mm

在柏拉图看来，良好政体的根本原则是（）

A、城邦受法律支配

B、城邦受统治者支配

C、城邦受特殊阶级支配

D、城邦受利益集团支配

波状褶皱（wave fold）