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问题 选择题

在锌跟稀硝酸反应时，若参加反应的锌与消耗的硝酸的物质的量之比为1:2.5时，则被还原的HNO3和未被还原的HNO3的物质的量之比为

A．2:5

B．1:4

C．1:5

D．1:9

答案

BD

Zn与HNO3的物质的量比为1:2.5即4:10。

则：4Zn+10HNO3="4Zn" (NO3)2+N­2O↑+5H2O ……………………①

4Zn+10HNO3="4Zn" (NO3)2+NH4N­O3↑+3H2O ……………………②

按反应①=1:4，按反应②

=1:9

多项选择题

对病毒有杀灭作用的消毒剂有()

A．乙醇

B．碘酊

C．碘伏

D．过氧乙酸

E．戊二醛
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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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