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更多“Describe the structure and fun…”相关的问题
A.A.MODIFY TABLE
B.B.MODIFY STRUCTURE
C.C.ALTER TABLE
D.D.ALTER STRUCTURE
Why are marine organisms good candidates for fossilization？
A．they have more fleshy structures than land organisms.
B．It is likely that they will be buried rapidly
C．The water environment speeds the decay caused by bacteria.
D．it takes longer for them to be preserved.
A．The plane flies at high altitudes.
B．The plane is filled with air.
C．The metal structure of the plane is very strong.
D．A small part of the plane cracks.
在Visual FoxPro中，下列不能用来修改数据表记录的命令是
A．EDIT
B．CHANGE
C．BROWSE
D．MODIFY STRUCTURE
Which of the following is not directly mentioned？
A．A living thing may adapt in its structure.
B．An organism may adapt in its function.
C．A living creature may adapt in its genetic makeup.
D．A living organism may adapt in its sleeping habit.
Questions 6-10
&8226;Look at the table of contents of a report provided by Industrial Development Agency of Ireland below．The table shows the sections of the report．
&8226;For questions 6-10．decide which section(A-H)would be needed by each person.
&8226;For each question，mark one letter(A-H)on your Answer Sheet.
&8226;Do not use any letter more than once？
THINKING OF INVESTING IN THIS COUNTRY？
Need to have a detailed knowledge of one or more of the following
TABLE of CONTENTS
A．Chairman and CEO Overview
B．Research and lnnovation
C．Investment Highlights
D．Statistics
E．Board and Committees of the Board 2007
F．Corporate Governance
G．Organisational Structu re and IDA offices
H Financial Statements
Sarah Lee would like to know the strengths in research in lreland．
Trees
To many, the word trees evokes images of such ancient, powerful, and majestic structures as the redwood and the giant sequoia (红杉), among the most massive and longest living organisms in the world. Although the majority of the Earth's biomass is represented by trees, the fundamental importance of these seemingly ubiquitous plants for the very existence and diversity of life on Earth is perhaps not fully appreciated. Our very biosphere is dependent on the metabolism, death, and recycling of plants, especially trees. Their vast trunks and root systems store carbon dioxide and water and respire oxygen into the atmosphere. The organic matter of the soil develops primarily from plant residues (that is, from decayed leaves, twigs, branches, roots, and fallen trees), which release important nutrients, such as nitrogen, carbon, and oxygen.
The tree is not an immutable biological category but rather a human concept based on visual criteria. Perhaps a general definition would describe a tree as a perennial(多年生的) woody plant that develops along a single main trunk to a height of at least 4.5 metres at maturity. This may be contrasted with a shrub, which might be loosely defined as a woody plant with multiple stems; in most cases, a shrub is less than 3 metres tall. However, a species fitting the description of either in one area of the world might not necessarily do so in other regions, since a variety of stresses shape the habit of the mature plant. Thus, a given woody species may be a tree in one set of habitats within its range and a shrub elsewhere. For example, the spruce and fir may thrive in the tree form. at the base of a mountain but assume a shrub form. near the mountain-top, the variation due principally to stresses exerted by such environmental conditions as altitude, temperature, and oxygen tension.
In the early stages of the development of terrestrial life, land plants were rootless and leafless, since they had their origins in aqueous environments, they did not require the specialized conducting and supporting tissues afforded by roots and stems, nor did they require localized regions of carbohydrate synthesis, since each cell was involved in metabolism, water and nutrient absorption, and respiration. Habitats farther from the water as well as aerial habitats represented available uninhabited environments.
One key to exploiting these habitats is large size. This, however, requires physiological and morphological (形态的) complexity. If all the tissues of massive tree trucks were alive, for example, the physiological cost of maintaining these structures in the living state would be enormous, and probably unattainable. The elegant solution came in the form. of tremendous structural adaptations, new tissues and organs permitted localization of the functions of the plant body.
The evolution of vascular tissues and localized regions of cell division permitted the strengthening and conducting tissue, called wood, to be dead, hollow, thick-walled tubes at functional maturity. Roots provided anchorage and absorption of sufficient amounts of water and nutrients to support the huge biomass of the tree. Stems were not only strong enough to support the tree and project it into ever higher habitats but conductive enough to transport the water and nutrients to the leaves at the very top of the tree.
The shape of a tree is an ecological construct as well, since its form. is dependent on the habitat and the stresses of the environment. Open-grown trees, such as those in gardens and parks, generally have foliage extending along the length of the trunk for a considerable distance. Forest trees, on the other hand, compete for growing space and generally have an expanse of foliage-free bole below a more limited tree crown. The aggregate of the tree crowns constitutes the canopy of the forest, and this may be displayed in a single layer or stratified (
A．Y
B．N
C．NG
Meterorology
The science of meteorology (气象学) is concerned with the study of the structure, state, and behavior. of the atmosphere. The subject may be be approached from several directions, but the scene cannot be fully appreciated from any one vantage point(46).
One may consider the condition of the atmosphere at a given moment and attempt to predict changes from that condition over a period of a few hours to a few days ahead(47)
Synoptic meteorology is the scientific basis of the technique of weather forecasting by of the preparation and analysis of weather maps and aerological (天气的，气象学的) diagrams.(48). In serving the needs of shipping, aviation, agriculture, industry, and many other interests and fields of human activity with accurate weather warnings and professional forecast advice, great benefits are reaped in the from of the saving of human life and property and in economic advantages of various kinds,(49).
The tools needed to advance our knowledge in this way are the disciplines of mathematics and physics applied to solve meteorological problems.(50).
A Different views must be integrated to give perspective to the whole picture.
B The use of these tools forms that branch of the science called dgnamic meteorology
C There are, of course, some exceptions.
D This approach is coverd by the branch of the science called synoptic meteorology.
E The practical importance of the numerous applications of weather forcasting can not be overestimated.
F One important purpose of meteorology is constantly to strive, through advanced study and research, to increase our knowledge of the atmosphere with the aim of improving the accuracy of weather forecasts.
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