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18. When traveling, you are advised to take travelers checks, which provide a secure____ to carrying your money in cash. A. substitute B. selection C. preference D. alternative [substitute] substitute 替代 substitution 保险代理人，替代品 constitute 构成，组成 constitution 宪法 amendment 修正案 amend 修正， institute 学院 institution 机构 rectify 修改，矫正 classify 分类 verify 证实，核实 [/substitute] [selection] selection 选择 select 选择 collect 收集 elect 选举 neglect 忽略，忽视 disabled 残疾的，伤残的 the disabled 残疾人 weakness 弱点 weak point 弱点， [/selection] preference 喜好，爱好 | 
