A. you broke the school rules.

　　B. you failed the test last Friday.

　　C. your teacher spoke to you loudly.

　　D. your teacher always criticizes you.

　　29. What is Paragraph 4 mainly about?

　　A. The power of our fight or flight response.

　　B. How our fight or flight response works.

　　C. The benefits of our fight or flight response.

　　D. How we control our fight or flight response.

　　30. The underlined word “They” in Paragraph 5 probably refers to ______.

　　A. fierce tigers

　　B. real dangers

　　C. dangers we face

　　D. serious physical threats

　　31. A good understanding of our fight or flight response can help us _______.

　　A. get rid of unnecessary stress.

　　B. face real dangers bravely.

　　C. find potential dangers.

　　D. take threats seriously.

　　D

　　According to a new study from Cornell University, about one-fifth of the global population, or 2 billion people worldwide, will be forced to resettle or go deeper inland by 2100 due to the continuous rise in sea level.

　　The study, published in the journal Land Use Policy, showed that the booming global population could make the matter worse. The researchers expected that there are about 1. 4 billion “climate change refugees(难民)” in the world by 2060 and by 2100 the number of the homeless people due to the rising sea level could reach up to two billion.

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