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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单项选择题
They had ______ from the path and found themselves at the feet of a hill.
A．wandered
B．waited
C．wired
D．walked
单项选择题
In the past, it was believed that ______ was more prevalent among the poorer and less educated people, but that is not the case.
A．destination
B．depression
C．definition
D．destruction
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