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．In place of physical therapy.B．To control brain problems.C．To prevent heart disease.D．To relieve depression.
A．In place of physical therapy.
B．To control brain problems.
C．To prevent heart disease.
D．To relieve depression.
单项选择题
A．Because it was one of the first tools.B．Because it developed human capacities.C．Because it led to the invention ol machines.D．Because it was crucial to the development of mankind.
A．Because it was one of the first tools.
B．Because it developed human capacities.
C．Because it led to the invention ol machines.
D．Because it was crucial to the development of mankind.
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