很简单的一个bacteria.csv文件，有两列，列名分别为control、treated，现有两个问题，如下：

a)      Check to see if diffmasked any objects.

b)       If so what type of object was it?

c)       What package did it belong to?

我的解答：首先读取 bacteria <- read.csv("C:\\Users\\Administrator\\Desktop\\bacteria.csv")

a) attach(bacteria)

运行结果如下：

The following objects are masked from bacteria (pos = 3):

    control, treated

b) mode(control);mode(treated)

运行结果如下：

[1] "numeric"

[1] "numeric"

c) 不知该如何操作，另外前两个问题的解答是否正确，还请各位大侠指导下，谢谢啊