单项选择题

Writing is a slow process ,requiring ______ thought, time and effort.

A．considerable
B．significant
C．enormous
D．numerous
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单项选择题
Whatever the collection consists of, there is always something to do in connection with it, from finding the right place for the latest addition to ______ facts in reference books.
A．identifying
B．determining
C．judging
D．verifying
单项选择题
It has been ______ that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
A．calculated
B．estimated
C．measured
D．valued
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