Look!There _is__ a book and two pencils on the desk.
and链接前后两个并列的物体, and前面用了'a', 所以可以知道book只有一本, 所以用is.
is
there be句型适用就近原则,
e.g. There is a book and two pens.
There are two pens and a book.
is
book是单数，无视其他
is 就近原则
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