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- 共用题干 Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary schoo...
- A large crowd assembled outside the American embassy.
- 共用题干 Robots May Allow Surgery in SpaceSmall robots designed by University of Nebraska researchers m...
- 共用题干 The Value of MotherhoodIn shopping malls,the assistants try to push you into buying“a gift to ...
- 共用题干 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....
- 共用题干 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 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 第三篇The Exploding Lakes of CameroonWhat comes to mind when you think of a lake?You probably ima...
- 共用题干 第三篇The Exploding Lakes of CameroonWhat comes to mind when you think of a lake?You probably ima...