The United States’ nominal GDP was about______ of nominal global

The United States’ nominal GDP was about______ of nominal global GDP.
A、a half
B、a third
C、a quarter
D、a fifth
【正确答案】：C
【题目解析】：The United States’ nominal GDP was estimated to be $16.6 trillion in June 2013, about a quarter of nominal global GDP. 参见教材P230。