单项选择题

It can be inferred that researchers abandoned the presynaptic hypothesis because______ .

A．a new and more attractive hypothesis was suggested
B．no research was reported that supported the hypothesis
C．research results provided evidence to counter the hypothesis
D．the hypothesis was supported only by studies of animals and not by studies of human beings
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单项选择题
Which of the following best expresses the main idea of ale passage
A．Research has suggested that the neurotransmitter serotonin is responsible for the effects of hallucinogenic drugs on the brain ant on behavior.
B．Researchers have spent an inadequate amount of time developing theories concerning the way in which the effects of hallucinogenic drags occur.
C．Research results strongly suggest that hallucinogenic drugs create their effects by acting on the serotonin receptor sites located on target neurons in the brain.
D．Researchers have recently made valuable discoveries concerning the effects of depleting the amount of serotonin in the brain.
单项选择题
Bill' s vulgar behavior affected Jane, who is very ______, and therefore, easily
A．decorous... affronted
B．garrulous... gratified
C．disinterested... biased
D．euphoric... ingratiated
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