2020届贵州省实验中学 高三英语三模试题及答案

2020届贵州省实验中学 高三英语三模试题及答案

第一部分 阅读（共两节，满分40分）

第一节（共15小题；每小题2分，满分30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项

A

Bird migration is described as the regular, seasonal movement of bird populations from one place to another

and back again.

The longer days and rich food of the northern summer provide greater chances for birds to feed their young.

The longer daylight hours and enormous food resources allow birds to lay larger eggs than those of related

non-migratory species that remain in the tropics all year round. As the days shorten in autumn and the breeding

period is over, the birds return to warmer regions where the available food supply differs little with the seasons

changing. The advantages of migration make up for the high stress, physical exertion（消耗）, and other risks of the

migration.

Day length is the primary environmental factor that encourages birds to prepare for migration. They have an

increased appetite which results in weight gaining, giving them the fat reserves that provide energy for their

migratory flight. They also show more activity at night, which is when most birds migrate. While the length of day

is the primary reason for migration, birds also respond to temperature changes. For example, if a spring is late and

the temperature is lower than normal, birds delay migration; if a spring is early, birds also begin migration early.

The timing of the migratory cycle must allow birds to arrive on the breeding site so that there is time tobuild

a breeding place, mate, lay the eggs, and hatch the young before the rich food is available to feed the young in the

nest. Similarly, if birds wait until the climate in their northern breeding grounds becomes tolerable(可忍受的),

there will be no time togain the necessary weight that provides the energy needed for their southbound

migration.

1. Why do birds migrate to the north in spring?

A The temperature in the south has risen.

B. They like traveling and enjoy the journey.

C. The summer there is warmer than that in the south.

D. The environment there is more suitable for them to feed their baby birds.

2. What are the two factors that cause birds to migrate?

A. Day length and food supply. B. Night length and high stress.

C. Temperature changes and daylength.

D. Food supply and temperature changes.

3. Which can be the best title for the text?

A. Birds' Life

B. Birds' Migration

C. Birds' Breeding Habits

D. Birds' Living Environment

B

Have you ever noticed that some people can eat what they want and stay in shape, while others carefully

watch what they eat and still put on weight? How annoying! However, scientists are beginning to believe that

some people get the ability to stay thin from their parents.

Scientists say that when some people eat, their bodies will naturally store the excess energy from food as fat.

These people gain weight if they eat more than they need each day. Meanwhile, other people eat more than they

need but their bodies are able to “burn off” the extra food without making fat, so they rarely have weight

problems.

To show that this is true, scientists have experimented on laboratory mice. They gave the mice a special diet

with a lot of fat. Some mice gained weight while the other mice stayed thin, even though both groups of mice ate

the same amount of food and got the same amount of exercise. Scientists concluded that weight gain seemed to

be influenced by genetic (基因的) factors. They also believe they have now identified the genes that may cause

this tendency. These genes, according to the scientists, get passed down the generations. Armed with this

knowledge, they believe it may be possible to develop medicines thatcan target the genes and stop people from

gaining weight.

The study of weight gain is becoming more important as the numbers of people who are overweight

continues to grow. In theUnited States, over seventy percent of the population have weight problems. This means

they are at risk of illness such as high blood pressure and heart disease.

Current medicines for weight control do not work very well because they can have serious side effects, such

as heart problems. However, it takes a long time to develop and thoroughly test new drugs. Therefore, despite this

breakthrough in the study of weight-loss drugs, scientists and health professionals all agree that currently the best

way to control weight gain is to have a healthy, balanced diet and an active lifestyle with daily exercise. This will