A：计数甲地内蒲公英总数，再除以甲地面积，作为甲地蒲公英的种群密度
B：计数所有样方内蒲公英总数，除以甲地面积，作为甲地蒲公英种群密度
C：计算出每个样方中蒲公英的密度，求出所有样方蒲公英密度的平均值，作为甲地蒲公英的种群密度
D：求出所有样方蒲公英的总数，除以所有样方的面积之和，再乘以甲地面积，作为甲地蒲公英的种群密度
已知圆C：（x﹣2）2+（y+1）2=3，从点P（﹣1，﹣3）发出的光线，经x轴反射后恰好经过圆心C，则入射光线的斜率为（ ）
阅读理解
Hello! My name is John, I have a happy family. There are four people in my family. They're my father, my mother, my baby sister and I. We have a beautiful garden. There are two trees and some flowers in it. There are some apples on the tree. Do you like apples and flowers? Welcome to my home.
一个自然数(0除外)除以0.98，商和这个自然数相比（ ）
