2019年大学英语四级写作要求：因果关系
在段落一开头，就用主题句点明其因果关系，然后选用相关材料，客观的罗列某些原因或结果，以阐述中心思想。
Growing numbers of well-to-do Americans are making the decision to move abroad. They find it impossible in America to walk the streets at night without fear of being raped, mugged, or murdered, nor do they see a way to escape the poisonous air of the cities. They maintain that even American food has become increasingly dangerous to eat. Last but not least, they insist that they are sick of the pace of American life, a pace that leaves no time for relaxation or pleasure.
因果关系常用语汇：
because of, so, owing to, thanks to, thus, as a result of, hence, for this reason, consequently, is caused by, lead to, result in
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