单项选择题

It can be inferred from the passage that which of the following is characteristic of the pterosaurs

A．They were unable to fold their wings when not in use.
B．They hung upside down from branches as bats do before flight.
C．They flew in order to capture prey.
D．They were an early stage in the evolution of the birds.
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单项选择题
Which of the following best describes the organization of the last paragraph of the passage
A．New evidence is introduced to support a traditional point of view.
B．Three explanations for a phenomenon are presented, and each is disputed by means of specific information.
C．Three hypotheses are outlined, and evidence supporting each is given.
D．Recent discoveries are described, and their implications for future study are projected
单项选择题
According to the passage, civil rights activists maintain that one disadvantage under which minority-owned businesses have traditionally had to labor is that they have
A．disadvantage in the sizable orders and subcontracts that are generated by large companies.
B．been denied bank loans at rates comparable to those afforded larger competitors.
C．not had sufficient opportunity to secure business created by large corporations.
D．not had adequate representation in the centers of government power.
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