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- 共用题干 Animals “Sixth Sense”A tsunami（海啸）was triggered（引发）by an earthquake in the Indian Ocean in Dec...
- 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A ...
- We had trouble finding a pure water supply.
- 共用题干 第三篇TapeStore: A New Tape Storage SystemTapeStore is a new kind of tape storage system which ca...
- 共用题干 Save Energy At HomeOn the average,Americans waste as much energy as two-thirds of the worlds p...
- 共用题干 Farmers MarketsCharlotte Hollins knows she faces a battle. The 23-year-old British farmer and ...
- 共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...
- She came across three children sleeping under a bridge.
- 共用题干 The Forbidden AppleNew York used to be the city that never sleeps. These days its the city tha...
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...