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．He needs to press F7 to return to the document before he prints it.B．He has to print the document to see the page numbers.C．The printer is not working correctly.D．The numbers are on the screen but they don’t print out.
A．He needs to press F7 to return to the document before he prints it.
B．He has to print the document to see the page numbers.
C．The printer is not working correctly.
D．The numbers are on the screen but they don’t print out.
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.
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