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- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- 共用题干 What Is Cancer?Cancer is actually a group of many related diseases that all have to do with ce...
- 共用题干 Clinical Trials1 Many clinical trials are done to see if a new drug or device is safe and effe...
- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- 共用题干 Owls and Larks1 In this article,we look at the importance of sleep for learning. Most healthy ...
- 共用题干 Influenza（流感）Influenza has been with us a long time. According to some Greek writers___1___ me...
- 共用题干 The Development of BalletBallet is a dance form that has a long history. The fact that it surv...
- 共用题干 第三篇Exercise Lowers Employers Health CostsCompanies can save millions in health-care costs simp...
- 共用题干 Step Back in TimeDo you know that we live a lot longer now than the people who were born befor...