单项选择题

The development of Dermanyssus gallinae belongs to complete metamorphosis.

A.正确
B.错误
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Dermanyssus gallinae can bite farm workers, causing dermatitis and pruritus.
A.正确
B.错误
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It would be difficult to prevent and control pig ascariasis but clearance of Ascaris suum eggs in the surrounding is a key step.
A.正确
B.错误
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