【单选题】Over the past two decades, age childbearing in the United States experienced a downward trend, and births to unmarried s between 1970 and 1990______.
【简答题】阅读理解。 What happens to a age kid when the world he thought he knew suddenly changes? Find out in Little Brother by American author Cory Doctorow. It is a fascinating book for a new generation of sc...