B

　　As the world's population grows, a lot of wild animals _____4_____ (force) to leave their natural home. Many wild animals are in danger. People kill them for food or fur, or because they compete with humans for food supplies. ____5____ (lucky), animal rescue organizations are working hard ___6___ (preserve) endangered animals and give them help. More and more people are realizing the importance of protecting wild animals.

【答案】4. are forced

5. Luckily 6. to preserve

【解析】

这是一篇说明文。介绍了许多野生动物都处在濒临灭绝的危险中，动物救援组织努力地保护野生动物，越来越多的人意识到保护野生动物的重要性。

【4题详解】

考查一般现在时的被动语态。句意：随着世界人口的增长，许多野生动物被迫离开他们的家园。分析句子可知，本句为一般现在时，主句为a lot of wild animals ，谓语为forced,主语与谓语为被动。故填 are forced.

【5题详解】

考查副词。句意：幸运的是，动物救援组织正在努力保护濒危动物并向它们提供帮助。Luckily为副词，置于句首，修饰整个句子。故填 Luckily.

【6题详解】

动词不定式。句意：幸运的是，动物救援组织正在努力保护濒危动物并向它们提供帮助。分析句子可知，动词不定式作目的状语，所以填 to preserve。故填 to preserve.

　　Smokejumpers are a special type of firefighter. They jump from planes into areas that are difficult to reach by car or on foot. When they arrive there, they first examine the land and decide ___7___to fight the fire. Their main goal is to stop a fire from _____8_____ (spread). They will use basic equipment to clear land of plants and other dry materials. The work is dangerous, _____9_____ they love being able to jump out of planes, fight fires, and live in the forest. As 38-year-old Alexi Tishin, who _____10_____ (work) as a smokejumper for 15 years, says, "This is the best job for tough guys."

【答案】7. how 8. spreading