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- 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 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...
- Many forms of cancer can be cured if detected early.
- I am feeling a lot more healthy than I was.
- Jane said that she couldnt tolerate the long hours.
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...