已知0＜a＜1，b＜﹣1，函数f（x）=ax+b的图象不经过[ ]
A.第一象限
B.第二象限
C.第三象限
D.第四象限
答案：A
简述超声的应用。
West of our school ___ two lakes ____ attract a large number of visitors. [ ]
A. are; that
B. is; where
C. is; that
D. are; where
