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【单选题】
A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of refrigerators. When they reach the o-zone layer in the atmosphere, their action cannot be halted. So there is no way to prevent these chemicals from damaging the ozone layer further. Which of the following, if true, most seriously weakens the argument above?A.
It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
B.
In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
C.
Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
D.
Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
E.
The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused.
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举一反三
【单选题】有一混合蛋白质溶液,期中蛋白质的pI值分别为4.1、5.0、5.3、6.7、7.3,电泳时欲使期中四种泳向正极,缓冲液pH应该是( )
A.
4.5
B.
5.0
C.
6.5
D.
7.0
【多选题】下列符合会计职业道德“提高技能”要求的有( )。
A.
出纳人员向银行工作人员请教辨别假钞的技术
B.
会计主管与单位其他会计人员交流隐瞒业务收入的做法
C.
会计人员积极参加会计职称培训
D.
总会计师通过自学提高会计职业判断能力、熟知经济政策
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