单项选择题

A．Four.
B．Five.
C．Six.
D．Seven.
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单项选择题
A species of plants or animals includes all such individuals that are similar to each other and have proceeded from one common parentage.
A．Y
B．N
C．NG
单项选择题
A．Because it was difficult to collect.B．Because it was difficult to get rid of.C．Because it came in a variety of forms.D．Because it tended to be absorbed by physical objects.
A．Because it was difficult to collect.
B．Because it was difficult to get rid of.
C．Because it came in a variety of forms.
D．Because it tended to be absorbed by physical objects.
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