题干
________ Mary ________ Jack is listening to the report carefully, because they are both interested in it very much.
A：Neither; nor
B：Either; or
C：Both; and
D：Not only; but also
答案(点此获取答案解析）
D
的两条渐近线和直线x=2围成一个三角形区域（含边界），则该区域可表示为