单项选择题

A．By asking each other what they see.
B．By looking out of windows.
C．By setting up many experiments.
D．By studying people’s eye’s.
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单项选择题
A．Post office clerk.B．AccountantC．Telephone operator.D．Salesman.
A．Post office clerk.
B．Accountant
C．Telephone operator.
D．Salesman.
单项选择题
A．A car running into a woman.B．A policeman stopping a driver to check his ID.C．Traffic congestion.D．4 children crossing the street with no adult’s company.
A．A car running into a woman.
B．A policeman stopping a driver to check his ID.
C．Traffic congestion.
D．4 children crossing the street with no adult’s company.
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