单项选择题

A．A scarcity of jobs in their field.
B．Inadequate training in methods of biological research.
C．Difficulties in classifying all of the varieties of owls.
D．A lack of funding for their work with endangered species.
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单项选择题
A．She knew nothing about his secret.B．She was a policewoman.C．She was one of the secretaries of the War Office.D．She loved Wilson very much.
A．She knew nothing about his secret.
B．She was a policewoman.
C．She was one of the secretaries of the War Office.
D．She loved Wilson very much.
填空题
preventable
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