单项选择题

A．They are necessary for modern man.
B．They are unnecessary for survival.
C．They are as good as computers.
D．They are dangerous for us.
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单项选择题
A．A child.B．An elderly person.C．A sick person.D．Anyone.
A．A child.
B．An elderly person.
C．A sick person.
D．Anyone.
单项选择题
A．They are rarely used today.B．They have a lot of uses.C．People often carry rulers with them.D．Every schoolchild has a ruler.
A．They are rarely used today.
B．They have a lot of uses.
C．People often carry rulers with them.
D．Every schoolchild has a ruler.
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