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问题 选择题

臭氧（O3）可使湿润的KI淀粉试纸变蓝，反应为KI+O3+H2OKOH+I2+O2（未配平），由此可得出下列结论正确的是(　　)

A．O3在反应中被氧化为O2

B．O3的氧化能力大于O2

C．1 mol O3在反应中得到2 mol电子

D．反应中氧化产物O2与还原产物I2的物质的量之比为1∶1

答案

答案：C

反应配平后：2KI+O3+H2O====2KOH+I2+O2

还原剂为I－，氧化剂为O3中的1个氧原子。

A中说O3在反应中被氧化，是错误的。

B中O3比O2的氧化能力大的说法是正确的，如Ag、Hg在空气或氧气中不易被氧化的金属，可以与臭氧发生反应。但在本题中由于O2的化合价没有改变，它既不是氧化产物也不是还原产物，故得出O3的氧化能力大于O2是不正确的。C项正确。D项不正确，O2不是氧化产物。

填空题

Part 4


Questions 26-45


·Read the following text and decide which answer bestfits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

How to Tell Which Side You Favor


Brain researcher Ned Herrmann tested more than 7,000 people to find out which side of the brain they favored. He found a p relationship between hemisphere (26) and the way subjects made a (27) : left-brain-oriented subjects were more often lawyers, writers, bookkeepers, doctors, tax experts, etc. —jobs (28) with logical, language-related information. Those who favored the right hemisphere (29) out to be poets, politicians, musicians, architects, entrepreneurs, dancers and (30) —top executives. Herrmann’s studies showed that the most successful people in any (31) are those who use both the left and right brains.
One test for hemisphere dominance is to (32) how you turn your head and eyes when (33) questions asked by someone in front of you. Research suggests that if you generally turn to the left, you have a right-brain (34) ; if you turn to the right, (35) are you prefer work that (36) use of logic or language.
Another test for dominance involves directions for (37) a product. A left-hemisphere- oriented person usually follows instructions in a step-by-step (38) —from written sentence to written sentence. Someone with p right-side input will probably (39) the written directions and assemble the pieces by (40) the diagram or picture.
If you think you’re right-brained, (41) this teaser. Read the sentence below carefully and count the number of f’s:
FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE EXPERIENCE OF MANY YEARS.
Did you find all six fs If not, don’t be surprised. Only 15 percent of those who take this test (42) .If you counted less than six—most count three—you probably (43) the f in each "of". Since "of" is pronounced "ov", the verbal left hemisphere took the verbal (44) and overrode the right, "seeing" hemisphere; (45) forcing the wrong conclusion.

A．takes

B．puts

C．involves

D．has
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问答题 简答题

工业热电阻使用的注意事项有哪些？
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