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- 共用题干 第二篇A Very Slow RideThe surface of the earth may seem very stable to you.But you might be amaz...
- 共用题干 Earth Angels1 Joying Brescia was 8 years old when she noticed that cigarette butts（烟头）were lit...
- 共用题干 Travel Across AfricaFor six hours we shot through the barren（荒芜的）landscape of the Karoo desert...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- The food is inadequate for ten people.
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin ...
- 共用题干 Solar StormAt the end of October 2003,a sudden solar storm hit the earth.A solar storm refers...
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...