下列哪一个不属于Google图书搜索的检索功能?（）
A.简单检索
B.列表浏览
C.高级检索
D.分类浏览
参考答案：B
已知ab=2．①若-3≤b≤-1，则a的取值范围是______；
②若b＞0，且a2+b2=5，则a+b=______．
_______ in thought, he almost ran into the car in front of him.[ ]
A. Losing
B. Having lost
C. Lost
D. To lose
