A:To buy a CD player.
B:To buy a new basketball.
C:To buy some drinks and snacks.
东南亚的印度尼西亚多火山地震的原因是 ( )
组成生物体蛋白质的氨基酸中,酪氨酸几乎不溶于水,而精氨酸易溶于水,这种差异的产生取决于