《2025年高中同步单元滚动强化卷高中英语必修第二册北师大版》

阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。
Animals can become endangered for a number of reasons, but many experts believe that loss of habitat is the main cause. Some animals are put 56 danger when people take over their habitats. This often 57 (occur) because people want one or more of the resources in those areas. Some forests, for example, provide wood 58 is used for things like paper and furniture, etc. Many trees 59 (cut) down every day for such purposes but not enough are being planted. It has seriously decreased the population of many species.
In some cases, loss of habitat arises 60 forest fires or flooding of land. Environmentalists and zoologists (动物学家) are 61 (frequent) trying to do what they can to prevent the number of populations from 62 (drop) too seriously.
Sometimes, people influence nature, indirectly causing the animals 63 (lose) their habitats. Experts believe the problem is becoming much 64 (bad) because of the emission of greenhouse gases. They don’t know 65 much influence people have, however. The greenhouse effect can also influence weather patterns that affect animals.

答案： 56.in 57.occurs 58.that/which 59.are being cut 60.from 61.frequently 62.dropping 63.to lose 64.worse 65.how