A:will
B:shall
C:are going to
D:went
方法1: ____+____+____ =191+97 =____(千米)
方法2: ____+(____+____)=88+200=____(千米)
once or twice, think about, look into, too …… to take ……. out of……
世界上到目前为止还没有国家的大洲是( )
化简或计算:(1)25=____,(2)3.14-π2 =____.