题目内容：
Canada is the second largest country in the world in area，although its 1is only some 25 mil-lion，most 2 in a 200。mile strip 3 the southern border．Over 25 per cent of the 4 number live in the three main cities．The northern areas of the country are almost uninhabited 5 for isolated settlements． Canada is 6 a rich country，and its national 7 per capita is the fifth highest in the world，but its economy in recent years has been rather 8 ，because of the varied nature of what it does．
Over the last three years，the Canadian economy has been hard 9 by falling oil prices and by rising US interest10 ．This has 11 to a steep fall in industrial production--by as much as a fifth since l98 1．Some12 now think Canada is on the 13 to recovery，though more cautious spirits say that no 1 4 can be expected until there is a 15 to lower interest rates in the USA．
（ ） A． people
B． residents
C． population
D． number
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