单项选择题

A．The invention of machines.
B．The invention of the alphabet.
C．The invention of rockets.
D．The invention of agriculture.
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单项选择题
A．Masses.B．Molten lava.C．Gasses.D．Unknown substances.
A．Masses.
B．Molten lava.
C．Gasses.
D．Unknown substances.
单项选择题
A．To look for a place to eat.B．To do some shopping.C．To finish the meeting and go home for a good rest.D．Stay in town for the whole week.
A．To look for a place to eat.
B．To do some shopping.
C．To finish the meeting and go home for a good rest.
D．Stay in town for the whole week.
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