近期,国内 IT市场上推出一款“苹果皮”产品,它的功能是将iPod Touch转型为具备电话、短信和GPRS上网功能(在调试中)的iPhone手机。而价格仅约为iPhone手机一半,深受消费者的欢迎。这段材料说明了( ) ①知识创新需要对已有知识的扬弃 ②知识创新是已有知识积累的量变 ③知识创新需要新思路、新方法 ④知识创新需要与旧知识彻底决裂 A.①③ B.②③ C.②④ D.①④用所给动词适当形式填空
-How about ________(walk) for a while after supper?
-I'd prefer ________(stay) at home to ________(walk).