人教高中英语复习课堂练习35 ：选择性必修3 Unit 5　Learning from nature Word版含解析.doc

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选择性必修第三册　Unit 5　Learning from nature
A组·基础巩固
Ⅰ. 语法填空
A
Sun Bear
Though small, they can be very aggressive, so if you see one, don't mistake it 1. ________ a soft lovely teddy bear！The sun bear lives in trees, 2. ________ you'll need to keep your eyes on the tree if you want to see one and you can only see them in the rainforests in Southeast Asia.
They are essential to our ecosystem because they help spread seeds while also keeping disgusted termites (白蚁) under control, which means there is less 3. ________ (destruct) of our tropical trees, which in turn 4. ________ (mean) our atmosphere is clean enough for us to live 5. ________ (healthy)．
When they do come down from the trees, they also dig for invertebrates (无脊椎动物) in the soil, 6. ________ (improve) the forest's nutrient cycle by mixing the rich and poor soil. Unfortunately, their global population 7. ________ (decline) 30% over the last few years, making them the second 8. ________ (rare) bear species next to the giant panda.
Their tongues are up to 25cm in 9. ________ (long) and help them to satisfy their greedy appetite for honey, 10. ________ sometimes makes them known as “honey bears”. You can tell the Sun Bear apart from other bear species from the horseshoe marks on their chest. No two markings are the same!
【语篇解读】本文是一篇说明文。文章主要介绍了太阳熊的相关信息。
1. for　考查固定搭配。mistake... for... 是固定短语，意为“把……错认为，把……误当作”。