单元检测(二)Ⅰ.语言知识及应用(共两节,满分45分)第一节 完形填空(共15小题;每小题2分,满分30分)阅读下面短文,掌握其大意,然后从1~15各题所给的A、B、C和D项中,选出最佳选项。Number sense is not the ability to count.It is the ability to recognize a __1__ in number.Human beings are born with this ability. __2__,experiments show that many animals are,too.For example,many birds have good number sense.If a nest has four eggs and you re