A. they usually do not want their citizens to communicate B. there are wars among countries C. a customs inspection D. people ma

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问题 A. they usually do not want their citizens to communicate
B. there are wars among countries
C. a customs inspection
D. people make barriers to block it
E. a health examination
F. they carried passes
Before foreign travellers are allowed to enter the country, they must go through______.

选项

答案C

解析 题干大意是:在国外游客入境之前,他们必须经过……。由此定位原文至第三段第二句Foreign travellers must go through a customs inspection before they areallowed to travel in the country,显然,所需添加成分即为a customs inspection,故C为正确答案。
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