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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

PHOTOSYNTHESIS

Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures. In such forms as oil, gas, and coal, they heat our homes, run our factories and power our cars.

Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. The most common photosynthetic pigment is chlorophyll. The bright green color characteristic of plants is caused by it. Most algae have additional pigments that may mask the green chlorophyll. Because of these pigments, algae may be not only green but brown, red, blue or even black.

In a series of enzyme-controlled reactions, the solar energy captured by chlorophyll and other pigments is used to make simple sugars, with carbon dioxide and water as the raw materials. Carbon dioxide is one of very few carbon- containing molecules not considered to be organic compounds. Photosynthesis then converts carbon from an inorganic to an organic form. This is called carbon fixation. In this process, the solar energy that was absorbed by chlorophyll is stored as chemical energy in the form of simple sugars like glucose. The glucose is then used to make other organic compounds. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply.

Organisms that are capable of photosynthesis can obtain all the energy they need from sunlight and do not need to eat. They are called autotrophs. Plants are the most familiar autotrophs on land. In the ocean, algae and bacteria are the most important autotrophs. Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs.

Advances in Photosynthesis and Respiration, Hardback.1990.

The word “fuel” is similar in meaning to ______.

A. provide nutrients for

B. produce organic materials 

C. give fuel to

D. help to function

Read the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the questions from 45 to 54

In comparison with most other places in the world, family identity is rather weak in Britain, especially in England. Of course, the family unit is still the basic living arrangement for most people. But in Britain this definitely means the nuclear family. There is little sense of extended family identity, except among some racial minorities. This is reflected in the size and composition of households.

It is unusual for adults of different generations within the family to live together. The average number of people living in each household in Britain is lower than in most other European countries. The proportion of elderly people living alone is similarly high.

Significant family events such as weddings, births and funerals are not automatically accompanied by large gatherings of people. It is still common to appoint people to certain roles on such
occasions, such as „best man‟ at a wedding, or godmother and godfather when a child is born. But for most people these appointments are of sentimental significance only. They do not imply lifelong responsibility. In fact, family gatherings of any kind beyond the household unit are rare. For most people, they are confined to the Christmas period.

Even the stereotyped nuclear family of father, mother and children is becoming less common. Britain has a higher rate of divorce than anywhere else in Europe except Denmark and the proportion of children born outside marriage has risen dramatically and is also one of the highest (about a third of all births). However, these trends do not necessarily mean that the nuclear family is disappearing. Divorces have increased, but the majority of marriages in Britain (about 55%) do not break down. In addition, it is notable that about three-quarters of all births outside marriage are officially registered by both parents and more than half of the children concerned are born to parents who are living together at the time.

Today, in Britain, many couples, mostly in their twenties or thirties, live together without getting married. Only about 60% of those couples will eventually get married. 40% of children in Britain are born to these cohabiting parents. In 2000, around a quarter of unmarried people between the ages of 16 and 59 were cohabiting in Great Britain. Unmarried couples are also starting families without first being married. Before 1960, this was very unusual, but in 2001, around 23% of births in the UK were to cohabiting couples.

What is the most suitable title for the whole passage?

A. British family types 

B. British family changes

C. British family identity 

D. British family relation