¡¡¡¡9.Which of the following best completes the passage below£¿
¡¡¡¡At a recent conference on environmental threats to the North Sea£¬ most participating countries favored uniform controls on the quality of effluents£¬ whether or not specific environmental damage could be attributed to a particular source of effluent. What must£¬ of course£¬ be shown£¬ in order to avoid excessively restrictive controls£¬ is that ___________.
¡¡¡¡£¨A£© any uniform controls that are adopted are likely to be implemented without delay
¡¡¡¡£¨B£© any substance to be made subject to controls can actually cause environmental damage
¡¡¡¡£¨C£© the countries favoring uniform controls are those generating the largest quantities of effluents
¡¡¡¡£¨D£© all of any given pollutant that is to be controlled actually reaches the North Sea at present
¡¡¡¡£¨E£© environmental damage already inflicted on the North Sea is reversible
¡¡¡¡10.Which of the following£¬ if true£¬ best completes the argument below£¿
¡¡¡¡Comparisons of the average standards of living of the citizens of two countries should reflect the citizens' comparative access to goods and services. Reliable figures in a country's own currency for the average income of its citizens are easily obtained.But it is difficult to get an accurate comparison of average standards of living from these figures. because¡ª¡ª¡£
¡¡¡¡£¨A£© there are usually no figures comparing how much of two different currencies must be spent in order to purchase a given quantity of goods and services
¡¡¡¡£¨B£© wage levels for the same job vary greatly from country to country£¬depending on cultural as well as on purely economic factors
¡¡¡¡£¨C£© these figures must be calculated by dividing the gross national product of a country by the size of its population
¡¡¡¡£¨D£© comparative access to goods and services is only one of several factors relevant in determining quality of life
¡¡¡¡£¨E£© the wealth£¬ and hence the standard of living£¬ of a country's citizens is very closely related to their income
