| In 1971 there were about 3,700 million
people in the world. If the population were{{U}} (21) {{/U}}evenly over
the earth’ s surface there would be about 50 people to the square mile; but
there are vast areas of desert and mountain and tropical forest{{U}} (22)
{{/U}}are uninhabited,{{U}} (23) {{/U}}at the other{{U}} (24)
{{/U}}, in the great cities millions may live within a few square
miles. {{U}} (25) {{/U}}of the world’ s population is concentrated on only a small{{U}} (26) {{/U}}of the earth’ s land surface, in the rich valleys and{{U}} (27) {{/U}}plains, because people up to the present time have{{U}} (28) {{/U}}to congregate in place where the climate and soil make it easy to grow food and obtain shelter. A{{U}} (29) {{/U}}world population and the discoveries of science{{U}} (30) {{/U}}this pattern of distrib A. Many B. Little C. Much D. Few 我来回答: 提交
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