选词填空（15选10）
    Botany, the study of plants, has a highly valued position in the history of human knowledge. From what we have 1) observed of preindustrial (工业化以前的) societies, a detailed study of plants must have been pretty ancient. Plants are the 2) basis of food for all living things, even for some other plants. They have always been 3) enormously important to human beings, not only for food, but also for clothing, weapons, tools, medicines, shelter, and many other 4) purposes. People who lived in the jungle of the Amazon can recognize a wide 5) range of plants and know their properties. To them, botany has no name and is probably not even recognized as a special branch of “knowledge” at all.
    However, 6) unfortunately, the more industrialized we become, the farther away we move from direct contact with plants. Now not many people have a reasonable 7) amount of botanical knowledge. About10,000 years ago, when our ancestors 8) discovered that certain grasses could be harvested and their seeds could be planted the next season, the 9) bond between plants and humans was formed. As a result crops were 10) cultivated. From then on, humans live on the production of plants.
A)  uncovered    B)  discovered    C)  cultivated    D)  explored
E)  observed    F)  range    G)  chain    H)  bond
I)  amount    J)  number    K)  resources    L)  basis
M)  purposes    N)  enormously    O)  unfortunately   
参考答案：
1) observed      2) basis      3) enormously      4) purposes      5) range      6) unfortunately      7) amount      8) discovered      9) bond      10) cultivated   
    Some people argue loudly that putting the bright and the not-so-bright children in the same class can have a bad effect on their development. According to them, it can also be quite 1) discouraging for those at the bottom of the class, but we think 2) otherwise.
    We believe it is definitely unfair to 3) classify our children just according to their 4) intellectual abilities. There are quite a lot of 5) disadvantages in doing so. Besides, it is agai
nst our educational purposes to develop the abilities of all our children to the full.
    However, in a mixed-ability class, there are various ways to help all children develop. Children often work in groups, which gives them the 6) opportunity to learn to share, to work together, and to develop leadership skills. They also learn how to make 7) decisions, to solve personal relationship problems as well as how to think and to communicate 8) effectively. Our children learn to do their best and we can give them extra encouragement to 9) attain the goal. Therefore, both their personal experiences and social skills are 10) enriched since they can learn from the teacher as well as from each other in a mixed-ability class.
A)  injuries    B)  disadvantages    C)  opportunity    D)  decisions
E)  projects    F)  enriched    G)  classify    H)  intellectual
I)  acquire    J)  attain    K)  discouraging    L)  frightening
M)  opposite    N)  otherwise    O)  effectively   
参考答案：
1) discouraging      2) otherwise      3) classify      4) intellectual      5) disadvantages      6) opportunity      7) decisions      8) effectively      9) attain      10) enriched   
    Melting sea ice and the earlier-than-normal movement of walruses (海象) have made scientists worried. Researchers 1) anticipate that this year might bring another mass migration of animals to shore.
    Walruses 2) stretch up highlive on shellfish (贝类动物) and other animals they find by diving to the seafloor. Normally, the walruses, 3) particularly females with baby walruses, rest on the floating sea ice during the summer. However, because of the global warming sea ice melts away and 4) vanishes over the relatively shallower waters where the walruses can feed. The 5) remaining ice stays only over water that is so deep that the walruses cannot dive down to the bottom for food. When this happens, the animals 6) stream back onto the land near shallower water.
    In recent years, researchers have found unusual 7) surges of mass migration have happened at an 8) incredible level, with walruses gathering in a(n) 9) immense number of more than 40,000. This can 10) strain the local ecosystem (生态系统) as the animals feed in a limited space, and many, generally the little walruses, get killed because it is too crowded. A recent study proved that the loss of sea ice was forcing more animals to swim longer distance, bringing danger to the life of their little ones.
A)  flow    B)  anticipate    C)  live    D)  vanishes
E)  rushes    F)  immense    G)  incredible    H)  particularly
I)  stream    J)  await    K)  strain    L)  finishes
M)  surges    N)  remaining    O)  believable   
参考答案：
1) anticipate      2) live      3) particularly      4) vanishes      5) remaining      6) stream      7) surges      8) incredible      9) immense      10) strain   

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