第9题: [单项选择]What does the writer think about the creation of new desert areas A. It is a natural development. B. The problem is not very serious. C. It is a very worrying problem. D. The situation will improve in tim 参考答案:C 答案解析:文章最后一句话作者是这样写的“At this rate there is a high risk that we will be confined to living on only 50% of t
第33题: [单项选择]调用线程的下列方法中,不能使线程暂停的方法是( )。 A. sleep() B. yield() C. stop() D. join() 参考答案:C 答案解析:[解析] sleep()方法的功能是使线程暂停,让出CPU,使更低优先级的线程运行;yield()方法的功能是使线程暂停,让出CPU,使同优先级的其他线程运行;join()方法的功能是使当前线程暂停,