【简答题】The one-child policy has been carried out for about 20 years .Most Chinese families have only one child. By the year 2008,the number of only children in China had already been 330 million ,which was a...
【单选题】Please cover the tasks for Lesson 6 Unit 1 on the course center. Then answer the following questions. 1. To “screen” ideas means to test them in order to ________ .