2. 外语
  3. Smugglers try to bring illegal items into the United States every day. People who travel to foreign countries sometimes try to a

Smugglers try to bring illegal items into the United States every day. People who travel to foreign countries sometimes try to a

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问题     Smugglers try to bring illegal items into the United States every day. People who travel to foreign countries sometimes try to avoid paying duty taxes on items they (47)______ on vacation. Some people try to enter our country (48)______. Who prevents these things from happening? This is the job of U.S. Customs Inspectors
    Customs officials work at (49)______ points to America. This includes airports, seaports, and our borders with Mexico and Canada. They work to prevent people from illegally entering America from, (50)______ countries and inspect items brought into the United States. They also work to prevent illegal drugs and (51)______ from coming to America. Inspectors must be very (52)______. Many tricks are used to smuggle both people and items into our country.
    American citizens who travel to other Countries also (53)______ customs officials. When people travel, they may purchase items to bring home. This merchandise must be (54)______. Customs officials inspect items and receipts to assess a duty tax. A person may bring eight hundred dollar worth of merchandise into America without paying a duty tax. Some people try to hide expensive items to avoid paying this tax. Sometimes people try to bring banned items to the U.S. Our laws (55)______ certain types of plants, foods, animals, and products from coming into our country.  These laws are for our (56)______. Plants and foods may carry harmful insects or diseases. Customs officials check carefully to make sure proper taxes are paid and banned items do not come into our country.

                 Word Bank:
A. encounter                   I. entry
B. protection                  J. terrorists
C. dangerous                   K. honest
D. observant                   L. foreign
E. illegally                   M. prohibit
F. environment                 N. freely
G. purchase                    O. declared
H. protected

选项
答案D
解析 从句法结构看，该题应填入一个形容词，该形容词用来修饰人，选项中符合这一要求的单词有dangerous， observant，honest和foreign。从句意看，空格所在句表达担任海关检查人员需要具备一定的条件，因为从下文的“Many tricks are used to smuggle both people and items into our country．”可知，总有一些不法分子使用诡计走私，针对这一现状，检查人员警惕性应提高，所以此处填入的单词应与“警惕”意义相关，答案显然是“observant”，表示“机警的”。
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