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- 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 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...
- The manager allocate duties to the clerks.
- The decision to invade provoked storms of protest.
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 共用题干 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...
- 共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells...
- Anderson left the table,remarking that he had some work to do.
- 共用题干 第一篇Renewable Energy SourcesToday petroleum（石油）provides around 40% of the worlds energy needs, ...