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Question
It can be inferred from the passage that which of the following is characteristic of the pterosaurs?
Options:
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.
Answer: Option A
:
A
The last line of the second paragraph mentions that “When a pterosaur walked or remained stationary, the fourth finger, and with it the wing, could only turn upward in an extended inverted V-shape along each side of the animal’s body.” Thus it is evident that the pterosaurs were unable to fold their wings when not in use. Therefore, answer option (a) is the correct answer choice.

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