单项选择题

It can be inferred from the passage that by the eleventh century the Byzantine militaryforces

A．had eliminated the Bulgarian army.
B．were comparable in size to the army of Rome under Augustus.
C．were strong enough to withstand the Abbasid Caliphate's military forces.
D．had achieved control of Byzantine governmental structures
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单项选择题
The ideas attributed to T. H. Huxley in the passage suggest that he would most likely agree with which of the following statements
A．An animal's brain size has little bearing on its ability to master complex behaviors.
B．An animal's appearance is often influenced by environmental requirements and physical capabilities.
C．Animals within a given family group are unlikely to change their appearance dramatically over a period of time.
D．The pterosaurs should be classified as birds, not reptiles.
单项选择题
It can be inferred from the passage that scientists now generally agree that the ______.
A．enormous wingspan of the pterosaurs enabled them to fly great distances
B．structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats
C．fossil remains of the pterosaurs reveal how they solved the problem of powered flight
D．pterosaurs were reptiles
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