IfthepopulationoftheEarthkeepson

欄目: 練習題 / 釋出於: / 人氣:1.78W

問題詳情：

If the population of the Earth keeps on__61._(increase) at its present rate，there will__62._(event) not be enough resources left to support life on the planet. By the middle of the 21st century，if present trends continue，we__63_(use) up all the oil that drive our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it__64 (necessity) for us to look for somewhere else. But__65._of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem，__66._， has recently been suggested by an American scientist, Professor Carl Sagan. Sagarn believes that__67._the Earth’s resources are completely__68_(exhaust) ，it will be possible to change the atmosphere of Venus and__69_create a new world almost as large as Earth itself. Something is difficult. Venus is much hotter than the Earth.__70. _， there is only a tiny amount of water there.

【回答】

61.解析:　考查短語keep on doing的用法。

*:increasing

62. 解析:　There will not be enough resources的主謂結構是完整的，所以只能用event的副詞形式eventually作狀語。

*:eventually

63. 解析:　時間狀語是by＋將來時間，謂語用將來完成時態。

*:will have used

64. 解析:　考查句型make＋it＋adj.＋for＋sb.＋to do sth.。

*:necessary

65. 解析:　考查理解和代詞。根據意思應該是“其他行星中到目前為止還沒有一個適合生命的生存。”none of＋複數名詞/不可數名詞，表示“……中沒有一個。”

*:none

66. 解析:　考查上下文理解和行文邏輯。前文說“沒辦法”，這裡說“可能的解決方案”所以用“however”表示轉折。