单项选择题

A．Protecting buyers of paintings.
B．Why copies of famous paintings are made.
C．How paintings are sold in the United States.
D．Protecting artists from illegal use of their work.
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单项选择题
What can we infer from Para. 4
A．Americans were much concerned about and well prepared for the possible threat.
B．Nuclear plants were the most important places that need protection.
C．Washington, DC would be perfectly safe under the protection of surface-to-air missiles.
D．These protective methods will make Americans less worried about the possible treat.
单项选择题
Which of the following is true according to Para. 2
A．It is said that only big states and cities will be in danger this time.
B．Americans have not talked too much about the possible threats.
C．It is said that Los Angeles is particularly in danger this time.
D．The aim of terrorism is to make Americans feel unsafe wherever they are.
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