单项选择题

A．The first group.
B．The second group.
C．The last group.
D．All the three groups.
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单项选择题
A．Artificial hearts.B．Telescopes.C．Microscopes.D．Radio telescopes.
A．Artificial hearts.
B．Telescopes.
C．Microscopes.
D．Radio telescopes.
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.
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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