题目

镍镉（Ni—Cd）可充电电池在现代生活中有广泛应用，它的充放电反应按下式进行： Cd(OH)2+2Ni(OH)2          Cd+2NiO(OH)+2H2O 由此可知，该电池放电时的负极材料是 （   ） A．Cd(OH)2       B．Ni(OH)2         C．Cd           D．NiO(OH) 答案：C句型转换。1.It is very important that we are in a good mood. (改为简单句）It is very important ______ ______ ______ ______ in a good mood.2.Many things around us affect our feelings and moods. (就划线部分提问）______ affect ______ feelings and moods?3.We should try to prepare for the meeting. (改为同义句）We should try to ______ ______ ______ the meeting.4.Why not finish your homework first? (改为同义句）______ ______ ______ ______ your homework first?