单项选择题

A．She wants the man to listen to the instructions and observe.
B．She wants the man to watch while she performs the operations.
C．She wants the man to ask questions so that she can help him.
D．She wants the man to try to do it while she gives him instructions.
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单项选择题
A．The heart pumps blood in two directions.B．Time 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.
A．The heart pumps blood in two directions.
B．Time 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.
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 tile page numbers.C．The printer is not working correctly.D．The numbers are on the screen but they don’t printout.
A．He needs to press F7 to return to the document before he prints it.
B．He has to print the document to see tile page numbers.
C．The printer is not working correctly.
D．The numbers are on the screen but they don’t printout.
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