问题描述：
that book so boring?（）you can know a lot about birds.
is that book so boring?（）
a.yes,you are right .
b.i am afraid so.
c.not at all.
d.of course.
is that book so boring?（）
a.yes,you are right .
b.i am afraid so.
c.not at all.
d.of course.
问题解答：
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