在横线里填上“＜”“＞”或“=”．
63750______743001080600______890450
578600______576800980009000______980000900．
（1）数位相同，最高位6＜7，所以63750＜74300；
（2）1080600是七位数，890450是六位数，所以1080600＞890450；
（3）数位相同，十万位与万位数字相同，千位上的8＞6，所以578600＞576800；
（4）数位相同，从亿位到万位数字都相同，千位上的9＞0，所以980009000＞980000900．
故答案为：＜、＞、＞、＞．
| 完形填空。 | |||
| There are four seasons in a year. They are spring, summer, fall and winter. 1________ is the first season of the year. It is getting 2________ and flowers begin to open. Trees and grass begin to turn 3________. It's usually rainy, people like to fly kites. Then it is summer and it is the 4________ season of the year. The days get 5________, so we can play in the afternoon. 6________ is the third season. It's very beautiful. It's not too hot and not too cold. There is usually 7________ in fall and leaves begin to turn yellow and come down. Many people like to have a picnic in the park. The last season of the year is winter. People usually don't like to go 8________ because it is cold. And there is sometimes 9________ in winter. Then we play with it. But it is the 10________ of the year. So we have to wear heavy clothes such as winter jacket in winter.
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