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TEXT C
There are two factors which determine an individual's intelligence. The first
is the sort of brain he is born with.
Human brains differ considerably , some being more capable than others. But
no matter how good a brain he has
to begin with, an individual will have a low order of intelligence unless he
has opportunities to learn. So the
second factor is what happens to the individual— the sort of environment in
which he is brought up. If an
individual is handicapped(不利 ) environmentally, it is likely that his brain
will fail to develop and he will never
attain the level of intelligence of which he is capable.The importance of
environment in determining an individual's intelligence can be demonstrated by
the case history of the identical twins, Peter and Mark. Being identical, the
twins had identical brains at birth, and their growth processes were the same.
When the twins were three months old, their parents died, and they were
placed in separate foster(抚养) homes. Peter was raised by parents of low
intelligence in an isolated community
with poor educational opportunities. Mark was reared in the home of
well-to-do parents who had been to college. He was read to as a child, sent to
good schools, and given every opportunity to be stimulated
intellectually. This environmental difference continued until the twins were
in their late teens, when they were
given tests to measure their intelligence. Mark's I. Q. was 125, twenty-five
points higher than the average and
fully forty points higher than his identical brother. Given equal
opportunities, the twins, having identical brains,
would have tested at roughly the same level.
11.This selection can best be titled____________.
A. Measuring Your Intelligence
B. Intelligence and Environment
C. The Case of Peter and Mark
D. How the Brain Influences Intelligence
12.The best statement of the main idea of this passage is that _______.
A. human brains differ considerably
B. the brain a person is born with is important in determining his
intelligence
C. environment is crucial in determining a person's intelligence
D. persons having identical brains will have roughly the same
intelligence
13.According to the passage, the average I. Q. is_______.
A. 85 . B. 100 C. 110 D. 125
14.The case history of the twins appears to support the conclusion
that_______.
A. individuals with identical brains seldom test at the same level B. an
individual's intelligence is determined only by his environment
C. lack of opportunity blocks the growth of intelligence
D. changes of environment produce changes in the structure of the brain
15.This passage suggests that an individual's I. Q. _______.
A. can be predicted at birth
B. stays the same throughout his life
C. can be increased by education
D. is determined by his childhood
