正确答案: A

国体

题目：处于国家政治制度多层次结构中的核心，决定了国家性质的是（ ）

解析：略

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举一反三的答案和解析：

[单选题]具有较好压缩效果的音频文件格式是______。

MP3文件

[单选题]In peacetime, nations may acquire special rights on open waters by______.

international agreements

解析：[解析] 见本文第五行第二句话。

[单选题]政府及其所属部门滥用行政权力，妨碍商品和服务在地区之间的自由流通，排除或限制市场竞争的行为称为（ ）

行政性限制市场准入

[单选题]根据《合同法》有关规定，当事人对合同变更的内容如果约定不明确的，则( )

推定未变更

[单选题]Curiosity is not only a possible motivation，it is also a great help in your learning languages. Remember that a language is not (11)______ a grammatical system. It is the (12)______ of a certain culture of different cultures. It is no good (13)______ strings of words and lists of grammatical rules (14)______ you know as much as possible about the background of the language，so that you can understand the ideas conveyed and the references made，as well as the inferences which can (15)______ the information clearly given. so learn as much as you can about the different cultures which (16)______ English-watch television programs，listen to the radio，try to obtain (17)______ and magazines written by native speakers，look at advertisements，and，above all，read-not textbooks， (18)______ novels，poems and plays. They will show you how a language is (19)______ used. The English language is a living form. of expression which derives much of its (20)______ from the context. and much of its effect from a whole network of extra-linguistic knowledge.(11)

just

解析：解析：不仅仅是。故选just。

[单选题]

AfterB． Taking

解析：[解析] 几分钟的犹豫之后。

[单选题]《爱尔克的灯光》所写的“灯光”中，象征着作者对新生活的信念和对理想的追求的是( )

“我仿佛又看见了一线光，一个亮，这还是我常常看见的灯光”

解析：ABC三项中的“灯光”象征旧家庭、旧礼教走向没落、崩溃；旧生活的悲剧和希望的破灭。