单项选择题

Each of those machines in the past can only perform ______.

A．many operations
B．two operations
C．a single operation
D．none of operations
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单项选择题
What does the woman want the man to do
A．She wants the man to listen to the instructions and observe.
B．She wants the man lo watch while she performs the operations.
C．She wants the man lo ask questions so that she can help him.
D．She wants the man to try to do it while she gives him instructions.
单项选择题
What prompted this conversation
A．The man is learning how to use a computer.
B．The woman is showing the man how to put page numbers on a document.
C．The man is printing a document.
D．The man is using his computer to do mathematical functions.
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