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) cat 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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