单项选择题

A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
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单项选择题
A．He was interested in the study of wild animals.B．He started the organization Heifer International.C．He was wounded in the Spanish Civil War.D．He sold his cows to many countries in the world.
A．He was interested in the study of wild animals.
B．He started the organization Heifer International.
C．He was wounded in the Spanish Civil War.
D．He sold his cows to many countries in the world.
单项选择题
A．To describe an upcoming video presentation,B．To introduce a lecture series.C．To introduce a speaker to a group.D．To provide background information for a special exhibit.
A．To describe an upcoming video presentation,
B．To introduce a lecture series.
C．To introduce a speaker to a group.
D．To provide background information for a special exhibit.
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