单项选择题

A．His desire to start his own business.
B．The crisis in his family life.
C．The decline in his health.
D．His dream of living in the countryside.
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单项选择题
A．Some sea creatures developed vertebrae.B．The first giant squid was captured.C．Some sea creatures shed their shells.D．Sea life became more intelligent.
A．Some sea creatures developed vertebrae.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.
单项选择题
A．Ten decades.B．A quarter of century.C．One decade.D．One-tenth of year.
A．Ten decades.
B．A quarter of century.
C．One decade.
D．One-tenth of year.
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