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- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells...
- 共用题干 Where Has the Salt Come from?Every now and then,we meet a fact about our earth that makes us f...
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- 共用题干 Thirst for OilWorldwide every day,we devour the energy equivalent of about 200 million barrels...
- In the background was that eternal hum.
- 共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin ...
- 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A ...
- 共用题干 Dark Forces Dominate UniverseThe earth,moon,sun and all visible stars in the sky make up less ...
- 共用题干 Thirst for OilWorldwide every day,we devour the energy equivalent of about 200 million barrels...