37.
（A） It was made of aluminum.
（B） It wasn't large enough.
（C） It wouldn't move in the wind.
（D） It was too heavy to put up.
38.
（A） To review material that will be on a test.
（B） To introduce a new professor.
（C） To explain changes in the schedule.
（D） To describe the contents of a paper.
39.
（A） At the beginning.
（B） In the middle.
（C） One week before the end.
（D） At the end.
40.
（A） Administer an examination.
（B） Present a conference paper.
（C） Explain next week's schedule.
（D） Take attendance in class.
41.
（A） A regular class will be given.
（B） An optional review class will be given.
（C） An exam will be given.
（D） Class will be canceled.
42.
（A） Rock formations in the Nevada desert.
（B） Graduate studies in anthropology.
（C） Excavation techniques used in archaeology.
（D） Prehistoric desert people of Nevada.
43.
（A） They planned their migrations.
（B） They didn't travel far from their base camps.
（C） They hid from their enemies in caves.
（D） They planted seeds near their camps.
44.
（A） They had trouble finding it.
（B） Lack of light made it impossible.
（C） It was too small for a group to fit into.
（D） Items stored by others took up most of the space.
45.
（A） Prehistoric desert people.
（B） Migratory animals.
（C） Food supplies and tools.