单项选择题

If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either or abandoned.

A．modified
B．ascertained
C．testified
D．violated
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单项选择题
Because there is evidence of severely harmful effects from chemical dumps, the government has tougher cleanup measures.
A．innovated
B．imposed
C．implemented
D．inflicted
单项选择题
We have made a(n) _________ order for the new product since we are not sure whether tho.local consumers will accept it.
A．ritual
B．tentative
C．inadequate
D．serial
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