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- 共用题干 第三篇Human Space ExplorationWhile scientists are searching the cause of the Columbia disaster,NA...
- 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 Save Energy At HomeOn the average,Americans waste as much energy as two-thirds of the worlds p...
- 共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin ...
- 共用题干 Migrant（移民的）WorkersIn the past twenty years,there has been an increasing tendency for workers ...
- 共用题干 The FamilyThe structure of a family takes different forms around the world and even in the sam...
- 共用题干 Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that ...
- 共用题干 When Our Eyes Serve Our StomachOur senses arent just delivering a strict view of whats going o...
- 共用题干 Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that ...
- Keep your passport in a secure place.