Questions 8 to 10 are based on the following news. At the end of the news item, you will be given 30 seconds to answer the questions.
Now listen to the news. According to the search operation commander, the recovery of the missing Americans is slowed down because
A．the weather conditions are unfavourable. B．the necessary documents are unavailable. C．the sites are inaccessible. D．some local people are greedy.