完形填空
(1) is an American girl. (2) name is Helen. And this is Mike. (3) is an English boy. Mike can (4) his name. Kate can sing ABC song. Mike's home phone number is 658-4323. He can (5) Kate at 954-3643. They (6) friends now.
与原点的距离为2.5个单位的点所表示的有理数是____
读如图,完成下列各题.