单项选择题

A．Pedestrians passed by.
B．Cars were moving slowly in the street.
C．Policemen patrolled the street.
D．Garbage cans were kept from the street.
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单项选择题
A．The fierce competition in the market. B．The great pressure of work. C．The reform of education system. D．The big numbers of retired people.
A．The fierce competition in the market.
B．The great pressure of work.
C．The reform of education system.
D．The big numbers of retired people.
填空题
Visvanathan suggests educating students about the basic knowledge of genes in order to improve their health.
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