Question 5 is based on the news report you have just heard.

听力原文：

    Lions have disappeared from much of Africa, but for the past few years scientists have wondered if the big cats were hanging on in remote parts of Sudan and Ethiopia. (5) Continuous fighting in the region has made surveys difficult.

    (6) But scientists released a report Monday documenting, with hard evidence, the discovery of “lost lions”.

    A team with Oxford University’s Wildlife Conservation Research Unit, supported by a charity organization, spent two nights in November camping in the National Park in northwest Ethiopia, on the Ethiopia-Sudan border. (7) The researchers set out six camera traps capturing images of lions, and they identified lion tracks.

    The scientists concluded that lions are also likely to live in the neighbouring National Park across the border in Sudan. The International Union for Conservation of Nature had previously considered the area a "possible range" for the species, and local people had reported seeing lions in the area, but no one presented convincing evidence.

5. What has made it difficult to survey lions in remote parts in Sudan and Ethiopia?

解析：A。本题为细节题。问题为：是什么使得在苏丹和埃塞俄比亚偏远地区调查狮子很困难？根据原文“Continuous fighting in the region has made surveys difficult.”，可知该地区的持续战争造成调查困难。选项A) Endless fighting in the region与原文一致，其中endless是对原文中continuous的同义替换。