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单项式 的系数和次数分别是（） A . -1，2 B . -1，3 C . ，1 D . ，3 答案：DD     The Voice of China has been a popular singing talent show on Zhejiang Satellite TV since July 13 ,2012. With so many talent shows on television,how is The Voice of China different?     The Voice of China is from the program —The Voice of Holland. It has now become Zhejiang Satellite TV’s most watched entertainment program.     So， what’s the show’s secret? Most importantly,itJs the so-called blind choice? where judges sit with their backs to the performers,making sure that the contestants are judged based on their voices alone. The show also has a famous group of judges,including mainland singers Na Ying,Liu Huan,Yang Kun and Taiwan pop star Harlem Yu. The super sound system is supported by Jin Shaogang.     Unlike other talent shows that open doors to the grassroots,contestants at The Voice of China are handpicked or in Liu’s words, “semi-professionar,. More than 40 staff went out to find talents in different ways. Their voices are recorded and these contestants are then put through auditions and finally,short-listed to appear on television.     These years there have been a growing number of talent competitions in China. Besides Super Girls,none has reached such success. When the activity is over,many young dreamers are again left in the cold. The Voice of China hopes to change that. Lu Wei,publicity director of the show,says that they plan to record the contestantsJ live songs into albums and sell in app stores.根据短文内容，简要回答下列问题。1. When did The Voice of China start?2. What’s the most important secret of The Voice of China"!3. Who are the judges in the group?4. How many steps does every contestant must experience to appear on television?