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- 共用题干 第三篇Human Space ExplorationWhile scientists are searching the cause of the Columbia disaster,NA...
- Anderson left the table,remarking that he had some work to do.
- 共用题干 Caribbean IslandsWhat would you see if you took a cruise to the Caribbean Islands?Palm trees a...
- 共用题干 Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the s...
- What puzzles me is why his books are so popular.
- Their parents once lived under very severe conditions.
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 The Joy of Living AloneMore and more Americans are living alone.Some live alone because of div...
- 共用题干 第三篇Renewable Energy SourcesToday petroleum（石油）provides around 40% of the worlds energy needs ,...
- 共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells...