单项选择题

A．Because it was one of the first tools.
B．Because it developed human capacities.
C．Because it led to the invention of machines.
D．Because it was crucial to the development of mankind.
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单项选择题
A．To visit the cinema and write a composition.B．To read a novel and write a summary.C．To read the textbook and make an experiment.D．To see a movie and write a comment.
A．To visit the cinema and write a composition.
B．To read a novel and write a summary.
C．To read the textbook and make an experiment.
D．To see a movie and write a comment.
单项选择题
A．Pollution of coastal areas.B．Rise in sea levels.C．Exhaustion of sea resources.D．Earthquakes and volcanoes.
A．Pollution of coastal areas.
B．Rise in sea levels.
C．Exhaustion of sea resources.
D．Earthquakes and volcanoes.
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