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