2. 外语
  3. According to the passage, only ______ trees can give us shade and products. People protect their environment by ______.

According to the passage, only ______ trees can give us shade and products. People protect their environment by ______.

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问题 According to the passage, only ______ trees can give us shade and products.
People protect their environment by ______.
选项 A、cutting down unhealthy trees
B、making changes around the trees
C、cooling and cleaning the air around the trees
D、protecting the environment for trees growth
答案D
解析 本题询问人们应该怎么做来保护环境。根据原文(38)处可知，树木有益于环境，同样树木需要良好的环境，它们是个相辅相成的过程，故选D。
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