The average values of wingspan in this sample is cm.

词汇与结构 The effect of wake turbulence on an aircraft depends on many factors, including the weight and the wingspan of the following aircraft and _________ positions of the following aircraft and wake vortices.

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