B) random chance
C) careful examination
D)computerized systems
7. Most customs agencies try to stop importing plants and animals mainly because they ________.
A) may threate national security
B) ca t adapt to new environment
C) are far from satisfactory in quality
D) are more constly than domestic ones
8. Some items are considered illegal because they come from a enemy country or one that is imposed on_________________.
9. By paying close attention to the cultural artifacts coming in or out of a country, customs agencies can help the artifacts going back to ____________.
10. In some countries, such goods as ivory and dog or cat furs are forbidden to import because of ___________.
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