更多"Fifty years from now the world’s po"的相关试题:
[填空题]Fifty years from now the world’s population will be declining, with no end in{{U}} (36) {{/U}}.Several centuries from now, unless people’s values changes{{U}} (37) {{/U}}, there could be fewer people living in the entire world than live in the United States today. The big{{U}} (38) {{/U}}of the past twenty years is that in not one country did fertility stop falling when it reached the{{U}} (39) {{/U}}rate -- 2.1 children per women. In Italy, for example, the rate has{{U}} (40) {{/U}}to 1.2. In Western Europe as a whole and in Japan it is down to 1.5. The evidence now{{U}} (41) {{/U}}that within fifty years or so world population will{{U}} (42) {{/U}}at about eight billion before starting a{{U}} (43) {{/U}}rapid decline. That has really posed a great deal of anxiety.{{U}} (44) {{/U}}, many people still fear that it will keep "exploding" until there are too many people for the earth to support. But{{U}} (45) {{/U}}. World population was growing by two percent a year in the 1960s; the r
[填空题]For years now, the world’s fastest trains, operating in Japan and France, have been stuck at a {{U}} (36) {{/U}} operating speed of around three hundred kilometers an hour—in fact the latest Japanese bullet trains travel a bit slower than their {{U}} (37) {{/U}}, the emphasis of the designers being more on {{U}} (38) {{/U}} and economy. Now JR East, the country’s largest railway company, has {{U}} (39) {{/U}} a much faster train, capable of {{U}} (40) {{/U}} speeds of around three hundred and sixty kilometers an hour.
The new train, which has been {{U}} (41) {{/U}} in a dazzling color, looks very similar to the {{U}} (42) {{/U}} models already running on Japan’s high-speed railways, except for one unusual feature—extra {{U}} (43) {{/U}} brakes in the form of cat’s ears that rise from the roof of the carriages—this, a response to the derailment (出轨) of a bullet train after an earthquake last year.
{{U}} (44) {{/U}}. Strictly speaking it isn’t the world’s fastest—that h
