Trees are one of the oldest living things on earth .They play a very important role for human’s existence. Trees are important for life as they provide food and oxygen. The importance of tree continues to increase and more benefits of trees are being discovered as their role expands to satisfy the needs created by our modern lifestyles. The forests and trees that are planted by humans work together with us to make the world look better and more beautiful. __71____Some of them are as follows.

Trees can clean soil and control soil erosion. Poisonous chemicals and pollutants from various factories enter into the soil, thus causing soil pollution.___72____Soil erosion is a serious problem that causes degradation(退化)of soil and leads to floods. Trees and plant roots bind the soil and thus reduce soil erosion. Also they conserve rainwater and reduce sediment(沉积)deposits.

  Trees produce oxygen . Trees play an important role in reducing the greenhouse gases. They consume carbon dioxide and produce oxygen.___73____A fully grown tree produces oxygen which is sufficient for10 people for a complete year. Also, they act as filters of the air that we breathe.

  Trees are of commercial importance. Trees fulfill the need of fuel for cooking in many areas around the world. Trees also provide timber for furniture and hundreds of household items. Wood pulp is used for making paper in industries.____74____Some trees are even used to make medicines.

____75____They provide shelter and food for a number of animal species across the globe. Trees are especially important as they form green corridors connecting habitats with each other and with the countryside beyond.

A This lowers global warming.

B Trees have beautified our planet.

C Trees act as the habitat for wild animals.

D In face, trees play different roles in our environment.

E Without trees our planet cannot be considered a place for living.

F Also, trees produce a number of fruits and nuts which are sold at market.

G Trees have the ability to store them or change them into less harmful forms.

Nowadays more and more people are interested in aerobic(adj. 健身操) exercises. There are many such programs on TV or you can just go to a club to learn the exercises. But here is some advice for you to follow once you decide to take them up or are just about to start.

First, get your doctor's permission to start an aerobic exercise program. He or she will check your physical condition and tell you whether it's safe to start exercising.

Make sure that each time you start with a warm-up period. You should stretch(伸展)your muscles and get them ready for your workout. Warm up for at least five minutes.

Then start actual training. Jog, bike, or do exercises that get your heart rate up to the target range. Depending on your age and your physical condition, aim to raise your pulse rate to be to between 140 and 160 beats per minute. Take your pulse during exercises to make sure that your heart rate doesn't get too fast. After the 20-minute aerobic exercises, start cooling down. Do a few gentle stretches while you catch your breath. If your heart rate does not return to a resting rate (about 70) within five minutes, you're working out too hard. Finally, during the recovery period, sit down and relax. The following graph(图表)will help you to learn about the safe pulse rate in each period.

68. You should      before you start an aerobic exercise program.

A. make sure that you are young enough

B. make sure that you have learned warm-up exercises

C. go to a doctor for a medical examination

D. learn a course of aerobic exercises on TV

69. What should your pulse rate be at the beginning of the cool-down period?

A. Around 70 beats.       B. Around 90 beats.

C. Around 130 beats.           D. Around 150 beats.

70. The warm-up period should last at least     .

A. 5 minutes      B. 10 minutes   C. 15 minutes    D. 20 minutes

In the old days, children were familiar with birth and death as part of life. This is perhaps the first generation of American youngsters who have never been close by during the birth of a baby and have never experienced the death of a family member.

Nowadays when people grow old, we often send them to nursing homes. When they get sick, we send them to a hospital, where children are forbidden to visit terminally(晚期的)ill patients – even when those patients are their parents. This deprives(剥夺)the dying patient of significant family members during the last few days of his and it deprives the children of an experience of death, which is an important learning experience.

Some of my colleagues and I once interviewed and followed about 500 terminally ill patients in order to find out what they could teach us and how we could be of more benefit, not just to them but to the members of their families as well. We were most impressed by the fact that even those patients who were not told of their serious illness were aware of its possible result.

It is important for family members, and doctors and nurses to understand these patients’ communications in order to truly understand their needs, fears and fantasies. Most of our patients welcomed another human being with whom they could talk openly, honestly, and frankly (坦白地)about their trouble. Many of them shared with us their great need to be informed, to be kept up-to-date on their medical condition and to be told when the end was near. We found out that patients who had been dealt with openly and frankly were better able to deal with the coming of death and finally to reach a true stage of acceptance prior (在先的)to death.

64. The elders in America today           .

A. were often absent when a family member was born or dying

B. were quite unfamiliar with birth and death

C. usually saw the birth or death of a family member

D. had often experienced the fear of death as part of life

65. Children in America today are deprived of the chance           .

A. to learn how to face death       B. to visit their family members

C. to look after patients                  D. to have access to a hospital

66. Five hundred terminally ill patients were interviewed with the main purpose of     .

A. observing how they reacted to the crisis of death

B. helping them and their families overcome the fear of death

C. finding out their attitude towards the coming of death

D. learning how to best help them and their families

67. What may be concluded from the text?

A. Dying patients are afraid of being told of the coming of death.

B. Most doctors and nurses understand what dying patients need.

C. Dying patients should be truthfully informed of their condition.

D. Most patients are unable to accept death until it can’t be avoided.

 0  36482  36490  36496  36500  36506  36508  36512  36518  36520  36526  36532  36536  36538  36542  36548  36550  36556  36560  36562  36566  36568  36572  36574  36576  36577  36578  36580  36581  36582  36584  36586  36590  36592  36596  36598  36602  36608  36610  36616  36620  36622  36626  36632  36638  36640  36646  36650  36652  36658  36662  36668  36676  151629 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网