单项选择题

According to this passage, chemistry ______.

A．produces more harmful effects than beneficial ones
B．produces no more harmful effects than beneficial ones
C．is no longer unanimously regarded as the science of the future
D．is not worth pursuing persistently
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单项选择题
According to the passage, Loyalism during the American Revolutionary War served the function of ______.
A．eliminating the disputes that existed among those colonists who supported the rebel cause
B．drawing upper, as opposed to lower, socioeconomic classes away from the rebel cause
C．tolerating the kinds of socioeconomic discontent that were not allowed to exist on the rebel side
D．absorbing members of socioeconomic groups on the rebel side who felt themselves in contention with members of other socioeconomic groups
单项选择题
The author considers the contentions made by the recent historians discussed in the ______.passage to be ______.
A．potentially verifiable
B．partially justified
C．logically contradictory
D．ingenious but flawed
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