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50-From the information given in the passage, it is clear that . .
***A)temperate regions are cooler than equatorial regions as sun-rays travel through more atmosphere to reach them
B)it is hotter in equatorial regions because they are closer to the Sun
C) when it is summer in the northern hemisphere. it is winter in the southern hemisphere
D)sun-rays lose heat in passing through space
E)summer is when the Earth is closest to the Sun

51-The angle at which the sun's rays strike the surface of the Earth is determined by . .

A)the density of the Earth's atmosphere
B)the parallel nature of the sun-rays
C)the direct journey which the sun-rays make to equatorial regions
***D)the curvature of the Earth
E)the variations in temperature on the Earth

The concept of a national library is a recent one in. the developing countries. In the developed countries, national libraries have existed since at least the sixteenth century. By the nineteenth century, most countries in Europe had already established national libraries. The typical national library is meant to be the finest collection of books in the country, the national book archive, and a source of national pride. Although it is important for a national library in a developing country to collect the national literature, and any other literature pertaining to that country, it is also important for the library to collect a wide range of scholarly literature published in other countries.

52-We learn from the passage that . .
A)every country must have a national library.
B)national libraries only exist in developed countries
C)by the nineteenth century most developing countries had established national libraries
***D)developed countries have had national libraries for longer than developing ones
E)a national library is relatively easy to establish

53-According to the passage, in the 19th century, there were few .

***A)European countries without a national library
B)developing countries that hadn't established a national library
C)libraries in the developing countries owning books published in other countries
D)libraries having the finest collection of world literature
E)developing countries having a work of literature that has existed since the l6thcentury

54-The author believes that a national library in a developing country should .. .

***A)contain the country's written works as well as foreign scholarly works
B)try to be better than a similar library in a developed country
C)take into account the prevailing climatic conditions of the country
D)develop a concept that has existed for a longer time in developed countries
E)establish guide-lines for the national literature

The 'forest fire season' in Canada generally extends from the latter part of April to mid-October. During last year's fire season, 9,317 forest fires burned a total of 2,618,299 acres of forest land. Weather conditions contributing to fire spread, coupled with unusually frequent and violent electrical storms, resulted in one of the most severe outbreaks of forest fires on record. Over the, season, 35.3% of all fires 'were caused by lightning. While these fires are generally considered to be more disastrous because of their tendency to start in difficult-to-reach areas -'88% of the total acreage burned last was attributed to lightning - man is nonetheless responsible for the greatest portion of forest fires. Human negligence was blamed 'for a total of 6,018 forest fires last year.