听力原文：Lots of countries, lots of businesses are plunging money into China.General Motors has this factory in Shanghai. The Park Hyatt is building this project in Beijing. It's a process repeated thousands of times. And of course, China is also busy selling things overseas. So where does all this lead? Well, China has now built up foreign reserves of one trillion dollars. That's a thousand billion, most of it in US currency, where even a small policy shift could throw global finance into chaos. Which of the following is true?