单项选择题

The pupa stage is not included in the lifecycle of the flea.

A.正确
B.错误
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单项选择题
In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Sociology. B、Psychology. C、Philosophy. D、Not mentioned.
单项选择题
Fleas have no strict host specificity.
A.正确
B.错误
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