按照达尔文的观点，奶牛产奶多是 [ ]
A．适应环境的结果
B．自然选择的结果
C．生存竞争的结果
D．人工选择的结果
答案：D
Use the following data related to MCE Corp’s inventory to answer
Assume no beginning inventory. Sales were $4500.
Calculate gross profit using LIFO and FIFO: LIFO FIFO（）①A. $ 2260 $ 2110 ②B. $ 2390 $ 2240 ③C. $ 2110 $ 2260
A. ①
B. ②
C. ③
若（x+2）（x-2）=x2-mx-n，则m=______，n=______．
