下列属于达到一定规模的危险性较大的分部分项工程的是（ ）。

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

铁路营业里程又称营业长度，是指办理客货运输业务的铁路线路总长度，包括正式营业和临时营业里程。对于全线或部分建成双线及以上的线路应按实际长度统计。

生产区域行走的安全规则:

PART VREADING COMPREHENSION

In this section there are four passages followed by questions or unfinished statements, each withfour suggested answers marked A, B, C and D. Choose the one that you think is the best answer.

TEXT A

Racket, din clamor, noise, whatever you want to call it, unwanted sound is America's most widespread

nuisance. But noise is more than just a nuisance. It constitutes a real and present danger to people's health. Day

and night, at home, at work, and at play, noise can produce serious physical and psychological stress. No one is

immune to this stress. Though we seem to adjust to noise by ignoring it, the ear, in fact, never closes and the

body still responds— sometimes with extreme tension, as to a strange sound in the night.

The annoyance we feel when faced with noise is the most common outward symptom of the stress building

up inside us. Indeed, because irritability is so apparent, legislators have made public annoyance the basis of

many noise abatement programs. The more subtle and more serious health hazards associated with stress

caused by noise traditionally have been given much less attention. Nevertheless, when we are annoyed or made

irritable by noise, we should consider these symptoms fair warning that other thing may be happening to us,

some of which may be damaging to our health.

Of many health hazards to noise, hearing loss is the most clearly observable and measurable by health

professionals. The other hazards are harder to pin down. For many of us, there may be a risk that exposure to the

stress of noise increases susceptibility to disease and infection. The more susceptible among us may experience

noise as a complicating factor in heart problems and other diseases. Noise that causes annoyance and irritability

in health persons may have serious consequences for these already ill in mind or body.

Noise affects us throughout our lives. For example, there are indications of effects on the unborn child when

mothers are exposed to industrial and environmental noise. During infancy and childhood, youngsters exposed

to high noise levels may have trouble falling asleep and obtaining necessary amounts of rest.

Why, then, is there not greater alarm about these dangers? Perhaps it is because the link between noise and

many disabilities or diseases has not yet been conclusively demonstrated. Perhaps it is because we tend to

dismiss annoyance as a price to pay for living in the modern world. It may also be because we still think of

hearing loss as only an occupational hazard.

1.In Paragraph 1, the phrase "immune to" are used to mean ___.

A.unaffected by

B.hurt by

C.unlikely to be seen by

D.unknown by

2.The author's attitude toward noise would best be described as ___.

A.unrealistic

B.traditional

C.concerned

D.hysterical

3.Which of the following best states the main idea of the passage?

A.Noise is a major problem; most people recognize its importance.

B.Although noise can be annoying, it is not a major problem.

C.Noise is a major problem and has not yet been recognized as such.

D.Noise is a major problem about which nothing can be done.

4.The author condemns noise essentially because it ___.

A.is against the law

B.can make some people irritable

C.is a nuisance

D.in a ganger to people's health

5.The author would probably consider research about the effects noise has on people to be ___.

A.unimportant

B.impossible.

C.a waste of money

D.essential