单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
Iron deficiency may result in sleeping problems for women.
A．Y
B．N
C．NG
单项选择题
Undocumented workers became the target of Operation Safe Travel because_________.
A．evidence was found that they were potential terrorists
B．most of them worked at airports under threat of terrorist attacks
C．terrorists might take advantage of their illegal status
D．they were reportedly helping hide terrorists around the airport
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