赞题库-背景图
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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热门试题

单项选择题A．The relationship between mice, rats and monkeys.B．The relationship between diet and animals.C．The relationship between diet and man.D．The relationship between diet and health.

A．The relationship between mice, rats and monkeys.
B．The relationship between diet and animals.
C．The relationship between diet and man.
D．The relationship between diet and health.

单项选择题A．At a butcher shop.B．At a restaurant.C．At a bookstore.D．At a grocery store.

A．At a butcher shop.
B．At a restaurant.
C．At a bookstore.
D．At a grocery store.