单项选择题

Questions 6 to 8 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. The trade outlook in Vietnam had clouded because ______.

A.the US stops importing Vietnamese shrimps
B.the WTO refuses Vietnam’s application for entry
C.the WTO accuses Vietnamese exporters of dumping
D.the US establishes trade barrier on Vietnamese shrimps exports