![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
The Apples example in Paragraph 4 is used to______.
A.
describe the working condition of Apple's manufacturing plant in China
B.
disclose the secret behind Apple's successful story
C.
sing praises for Chinese workers' team-work spirit and high productivity
D.
explain why the cheap labor in developing countries is a threat for American labor market