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问题 选择题

某化学反应表示为：M+酸→N+盐，其中M、N的物质类别不可能是（　　）

A．氧化物、酸

B．单质、单质

C．碱、氧化物

D．盐、酸

答案

A中若发生复分解反应，根据反应M+酸→N+盐，M是金属氧化物时生成盐和水，N应为水，不会生成酸，则A不可能，故A正确．

B中若发生置换反应，根据反应M+酸→N+盐，M与N可能是金属单质和氢气，则B可能，故B不合题意．

C中若发生复分解反应，根据反应M+酸→N+盐，酸碱中和反应生成盐和水，则M是碱，N是氧化物正确，故C不合题意．

D中若发生复分解反应，根据反应M+酸→N+盐，M与N可能是盐和酸，发生强酸制弱酸的反应，则D可能，故D不合题意．

故选A．

单项选择题

Oscar Night Oscar Night is one of the most awaited events in the entire entertainment industry of the world. The award ceremony has become an inseparable component of the life of all the people associated with Hollywood. One cannot simply escape the charm of this wonderful night. The Scheduled time of the glitzy evening of Academy Award is usually late February or early March. It is time when the awards are presented for the year-best achievements in the Motion Picture Industry. The Oscar statuette, presented during the Awards night. Is regarded to be the most prestigious honor for Hollywood artists. Oscar ceremony was started with the intention of acknowledging the excellence in Holly- wood. It was also an approach, made along time back, to encourage the spirit of the people connected with the Motion picture industry. The various categories of award try to honor people involved in all the facets of filmmaking. Academy Awards Night comprises of that point of time when the talented artists of the film fraternity get the apt recognition. It is the best way of honoring the efforts and dedication that go into the making of a movie. Oscars are organized in a grand manner, with an alluring appeal. This mega event takes place an the Kodak Theatre, in Los Angeles, annually. Oscar Night is the much-awaited moment, when all the stars of Hollywood gather at a single venue, The Red Carpet is roiled out for the dignitaries of the function. The air is filled with the gusto and zeal of the celebrities, who are invited to witness this ceremony. The atmosphere of Oscar Night is ruled by an element of surprise. It is the night when the mystery unfolds with each passing moment, with the announcement of winners in various categories.

The Oscar statuette, presented during the Awards night, is regarded to be the most prestigious honor for Hollywood artists.______

A．The underlined word "prestigious" in the sentence means "respective".

B．The underlined word "prestigious" in the sentence means "notorious".

C．The underlined word "prestigious" in the sentence means "respectable".

D．The underlined word "prestigious" in the sentence means "disastrous".
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多项选择题

教育储蓄为就读于（）、硕士和博士研究生。

A、全日制高中（中专）

B、大专

C、大学本科

D、初中
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