题目

More and more people are signing up for Yoga classes nowadays, ______ advantage of the health and relaxation benefits.      A. taking    B. taken    C. having taken   D. having been taken   答案：A甲、乙两种物质，它们的质量跟体积关系如图所示，则ρ甲     ρ乙（选填“＞”、“＜”或“=”），其中乙物质可能是     ．