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

The proper title for this passage should be ______.

A．The Positive Impact of Chemistry
B．The Harmful Effects of Chemicals
C．Progress in Chemistry
D．Chemistry and Society

单项选择题

According to the passage, which of the following is a true statement about sectional conflicts in America between 1763 and 17897 ______.

A．There conflicts were instigated by eastern interests against western settlers.
B．These conflicts were the most serious kind of conflict in America.
C．The conflicts eventually led to openly expressed class antagonism.
D．These conflicts contained an clement of class hostility.