Tommy:Dad,
what
are
four
grapes
and
three
grapes?
Dad:
Don‘t
you
know
simple
arithmetic?Haven‘t
you
done
a
problem
like
that
before?
Tommy:
No,
Dad,
we
always
use
bananas
at
school.
汤米：爸爸，四粒葡萄加三粒葡萄等于多少？
爸爸：你难道连这么简单的算术题都不知道吗？以前你没有做这类似这样的
问题吗？
汤米：做过，爸爸，不过在学校我们总是用香蕉来计算的．