A researcher discovered that people who have
low levels of immune-system activity tend to score much lower on tests of
mental health than do people with normal or high immune-system activity. The
researcher concluded from this experiment that the immune system protects
against mental illness as well as against physical disease.
16. The
researcher’s conclusion depends on which of the following assumptions?
(A) High
immune-system activity protects against mental illness better than normal
immune-system activity does.
(B) Mental
illness is similar to physical disease in its effects on body system.
(C) People with
high immune-system activity cannot develop mental illness.
(D) Mental
illness does not cause people’s immune-system activity to decrease.（D）
(E)
Psychological treatment of mental illness is not as effective as is medical
treatment.
17. The
researcher’s conclusion would be most seriously weakened if it were true that
(A) there was a
one-year delay between the completion of a pilot study for the experiment and
the initiation of the experiment itself
(B) people’s
levels of immune-system activity are not affected by their use of medications
(C) a few
people with high immune-system activity had scores on the test of mental health
that were similar to the scores of people who had normal immune-system activity
(D) people who
have low immune-system activity tend to contract more viral infections than do
people with normal or high immune-system activity（E）
(E) high levels
of stress first cause mental illness and then cause decreased immune-system
activity in normal individuals
20. Seven
countries signed a treaty binding each of them to perform specified actions on
a certain fixed date, with the actions of each conditional on simultaneous
action taken by the other countries. Each country was also to notify the six
other countries when it had completed its action.
The simultaneous-action provision of the
treaty leaves open the possibility that
(A) the
compliance date was subject to postponement, according to the terms of the
treaty
(B) one of the
countries might not be required to make any changes or take any steps in order
to comply with the treaty, whereas all the other countries are so required
(C) each
country might have a well-founded excuse, based on the provision, for its own
lack of compliance
(D) the treaty
specified that the signal for one of the countries to initiate action was
notification by the other countries that they had completed action（C）
(E) there was
ambiguity with respect to the date after which all actions contemplated in the
treaty are to be complete 答案分别是 D E C 但不知为何？？
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发表于 2007-7-24 09:43:00
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