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问题 填空题

下列动物中，属于两栖纲的是（　　）

A．甲鱼

B．鳄

C．青蛙

D．鲸

答案

在选项中具有“幼体生活在水中，用鳃呼吸；成体生活在水中或陆地上，用肺呼吸，同时用皮肤辅助呼吸”的动物只有青蛙；甲鱼是卵生爬行动物，虽然是水陆两栖生活，但是幼体不是用鳃呼吸而是用肺呼吸，所以不属于两栖动物；鳄虽然可以在水中游动但是仍属于爬行动物，与甲鱼一样不属于两栖动物；鲸生活在水中，用肺呼吸，胎生，属于哺乳动物．

故选C

填空题

A good translator is by definition bilingual. The opposite is not ______(1) true, however. A born and bred bilingual will still need two__________(2) to become a translator: first, the skills and experience necessary for__________(3); second, knowledge of the field in which he or she will__________(4). The skills and experience for translation include the ability to write ______(5) in the target language, the ability to read and understand the_________(6) language material thoroughly, and the ability to work with the latest__________(7) and communication hardware and software.Does a born and bred bilingual__________(8) a better translator than someone who learned language B later in__________(9) There is no definite answer, but the following issues are important.__________(10), a born and bred bilingual often suffers from not truly knowing __________(11) language well enough to translate, with some even suffering from what __________(12) known as a lingualism, a state in which a person lacks_________(13) full, fluent command of any language. Second, born and bred bilinguals__________(14) don’’t know the culture of the target language well enough to_________(15) top-quality translations, or cannot recognize what aspects of the source language__________(16) its culture need to be treated with particular care, as they_________(17) in a sense too close to the language. And last, they often_________(18) the analytical linguistic skills to work through a sticky text.On_________(19) other hand, the acquired bilingual may not have the same in-depth _________(20) of colloquialisms, slang, and dialect that the born bilingual has. Also, the acquired bilingual will not be able to translate as readily in both directions (from B to language A and A to language B). Finally, born bilinguals often have a greater appreciation of the subtleties and nuances of both their languages than someone who learns their B language later in life can ever hope to have.
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选择题

17.1%的蔗糖溶液200g，加适量的水稀释到5L，求稀释后的蔗糖溶液的物质的量浓度（蔗糖相对分子质量为342）                          

A．0.2 mol·L－1

B．0.3 mol·L－1

C．0.02 mol·L－1

D．0.1 mol·L－1
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