单项选择题

A．The heart pumps blood in two directions,
B．The blood is circulated round the body in one direction only by the pumping action of the heart.
C．The blood moved with a backward and forward motion.
D．The heart pumps blood in all directions.
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单项选择题
A．Mice.B．Rats.C．Monkeys.D．A, B and C
A．Mice.
B．Rats.
C．Monkeys.
D．A, B and C
单项选择题
A．People used to accept ideas and theories.B．People used to accept undoubtedly many of the ideas and theories, correct and incorrect.C．Scientists and philosophers had never studied the human body and its functions.D．Many of the ideas and theories that people used to accept were all incorrect.
A．People used to accept ideas and theories.
B．People used to accept undoubtedly many of the ideas and theories, correct and incorrect.
C．Scientists and philosophers had never studied the human body and its functions.
D．Many of the ideas and theories that people used to accept were all incorrect.
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