Editorial：
Critics of nuclear power complain about the allegedly
serious harm that might result from continued operation
of existing nuclear power plants. But such concerns do
not justify closing these plants；after all, their operation
has caused no more harm than that caused by pollution
generated by coal-and oil-burning power plants, the
most important other sources of energy
Which of the following is an assumption on which the
argument depends？
(A) Existing nuclear power plants should be closed only
if it can be conclusively demonstrated that their
continued operation is likely to cause harm more
serious than the harm their operation has already
caused.
(B) Closing existing nuclear power plants would require
greatly increased reliance on coal-and oil-burning
power plants.
(C) The harm that has resulted from operation of
existing coal-and oil-burning power plants has
been significant.
(D) The harm that a nuclear power plant is likely to
cause as it continues to operate can be reliably
predicted from the past history of nuclear power
plants.
(E) The only harm that has resulted from operation of
existing coal-and oil-burning power plants has
resulted from the pollution generated by these
plants.作者: 二爷08 时间: 2012-2-7 10:14:09
11. Children whose biological parents both have Tic
Syndrome Z (TSZ), which is characterized by the
involuntary contraction of certain muscles, are about
four times more likely to develop such contractions
than are children whose biological parents do not
have TSZ, It is likely, therefore, that predisposition
to TSZ is an inherited trait.
Which of the following, if true, would most strengthen the conclusion above
(A) Children whose parents have TSZ are more
likely to develop TSZ if they are under unusual
stress at school or at home than if they are not
under such stress.
(B) Children whose biological parents do not have
TSZ are more likely to develop TSZ if they are
raised by adoptive parents with TSZ than if
they are raised by their biological parents.
(C) Children whose biological parents have TSZ are
as likely to develop TSZ if they are raised by
adoptive parents who do not have TSZ as if
they are raised by their biological parents.
(D) Children whose biological parents have TSZ and
who develop TSZ usually avoid developing a
severe form of the syndrome if they seek
treatment for TSZ shortly after developing the
first signs of it.
(E) Children with TSZ whose biological parents do
not have TSZ are less likely to have the syn-
drome diagnosed when symptoms first appear
than are children with TSZ whose biological
parents have TSZ.作者: 846136085 时间: 2012-2-7 11:25:52
