单项选择题
__________ Plastics, the machine is light in weight.
单项选择题 Many an airplane and many a big gun __________ in the exhibition.
单项选择题 The advantage of the new bridge will be the way it __________ the towns on the opposite banks of the river.
单项选择题 Mrs.Karnowsky has the __________ being the oldest person to graduate from this college.