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） 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