首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
New Zealand Seaweed Call us not weeds; we are flowers of the sea. Section A Seaweed is a particularly nutritious food, which abs
New Zealand Seaweed Call us not weeds; we are flowers of the sea. Section A Seaweed is a particularly nutritious food, which abs
admin
2015-03-03
51
问题
New Zealand Seaweed
Call us not weeds; we are flowers of the sea.
Section A
Seaweed is a particularly nutritious food, which absorbs and concentrates traces of a wide variety of minerals necessary to the body’s health. Many elements may occur in seaweed—aluminium, barium, calcium, chlorine, copper, iodine and iron, to name but a few—traces normally produced by erosion and carried to the seaweed beds by river and sea currents. Seaweeds are also rich in vitamins: indeed, Eskimos obtain a high proportion of their bodily requirements of vitamin C from the seaweeds they eat.
The nutritive value of seaweed has long been recognized. For instance, there is a remarkably low incidence of goiter amongst the Japanese, and for that matter, amongst our own Maori people, who have always eaten seaweeds, and this may well be attributed to the high iodine content of this food. Research into old Maori eating customs shows that jellies were made using seaweeds, fresh fruit and nuts, fuchsia and tutu berries, cape gooseberries, and many other fruits which either grew here naturally or were sown from seeds brought by settlers and explorers.
Section B
New Zealand lays claim to approximately 700 species of seaweed, some of which have no representation outside this country. Of several species grown worldwide, New Zealand also has a particularly large share. For example, it is estimated that New Zealand has some 30 species of Gigartina, a close relative of carrageen or Irish moss. These are often referred to as the New Zealand carrageens. The gel-forming substance called agar which can be extracted from this species gives them great commercial application in seameal, from which seameal custard is made, and in cough mixtures, confectionery, cosmetics, the canning, paint and leather industries, the manufacture of duplicating pads, and in toothpastes. In fact, during World War II, New Zealand Gigartina were sent to Australia to be used in toothpaste.
Section C
Yet although New Zealand has so much of the commercially profitable red seaweeds, several of which are a source of agar(Pterocladia, Gelidium, Chondrus, Gigartina), before 1940 relatively little use was made of them. New Zealand used to import the Northern Hemisphere Irish moss(Chondrus crispus)from England and ready-made agar from Japan. Although distribution of the Gigartina is confined to certain areas according to species, it is only on the east coast of the North Island that its occurrence is rare. And even then, the east coast, and the area around Hokiangna, have a considerable supply of the two species of Pterocladia from which agar is also available. Happily, New Zealand-made agar is now obtainable in health food shops.
Section D
Seaweeds are divided into three classes determined by colour—red, brown and green—and each tends to live in a specific location. However, except for the unmistakable sea lettuce(Ulva), few are totally one colour; and especially when dry, some species can change colour quite significantly—a brown one may turn quite black, or a red one appear black, brown, pink or purple.
Identification is nevertheless facilitated by the fact that the factors which determine where a seaweed will grow are quite precise, and they tend therefore to occur in very well-defined zones. Although there are exceptions, the green seaweeds are mainly shallow-water algae; the browns belong to medium depths, and the reds are plants of the deeper water. Flat rock surfaces near mid-level tides are the most usual habitat of sea-bombs, Venus’ necklace and most brown seaweeds. This is also the location of the purple laver or Maori karengo, which looks rather like a reddish-purple lettuce. Deep-water rocks on open coasts, exposed only at very low tide, are usually the site of bull kelp, strapweeds and similar tough specimens. Those species able to resist long periods of exposure to sun and air are usually found on the upper shore, while those less able to stand such exposure occur nearer to or below the low-water mark. Radiation from the sun, the temperature level, and the length of time immersed all play a part in the zoning of seaweeds.
Section E
Propagation of seaweeds occurs by spores, or by fertilization of egg cells. None have roots in the usual sense; few have leaves, and none have flowers, fruits or seeds. The plants absorb their nourishment through their fronds when they are surrounded by water: the base or "holdfast" of seaweeds is purely an attaching organ, not an absorbing one.
Section F
Some of the large seaweeds maintain buoyancy with air-filled floats; others, such as bull kep, have large cells filled with air. Some, which spend a good part of their time exposed to the air, often reduce dehydration either by having swollen stems that contain water, or they may(like Venus’ necklace)have swollen nodules, or they may have distinctive shape like a sea-bomb. Others, like the sea cactus, are filled with slimy fluid or have coating of mucilage on the surface. In some of the larger kelps, this coating is not only to keep the plant moist but also to protect it from the violent action of waves.
You should spend about 20 minutes on Questions 1-13 which are based on Reading Passage 1 on the following page.
Questions 1-6
Reading passage 1 has six sections A-F.
Choose the correct heading for each section from the list of headings below.
Write the correct number i-x in boxes 1-6 on your answer sheet.
List of Headings
i Locations and features of different seaweeds
ii Various products of seaweeds
iii Use of seaweeds in Japan
iv Seaweed species around the globe
v Nutritious value of seaweeds
vi Why it doesn’t dry or sink
vii Where to find red seaweed
viii Under-use of native species
ix Mystery solved
x How seaweeds reproduce and grow
Section B
选项
答案
ii
解析
与该段落信息对应的选项有i,ii,iv,viii。选项i(Locations and features of different seaweeds)可以排除,因为该段落虽然提及多种不同的“differentspecies”,但是并没有主要讲它们的“locations”和“features”。选项iv(Seaweedspecies around the globe)也可以排除,因为该段落主要讲的是New Zealand的海藻。选项viii(Under-use of native species)也应该排除,因为该段落讲到新西兰本国的“native species”,但是“under-use”的信息并未提及。选项ii(Various products ofseaweeds)与该段落信息对应,且该段落提及具体的“products”的信息,例如“agar”,“seameal”,“cough mixture”等等。所以答案为ii。
转载请注明原文地址:https://kaotiyun.com/show/cwNO777K
本试题收录于:
雅思阅读题库雅思(IELTS)分类
0
雅思阅读
雅思(IELTS)
相关试题推荐
Theprimaryimpulseofeachhumanbeingisto______himself,butthesecondaryimpulseistoventureoutoftheself,tocorrect
ScientistshavelongsoughtthereasonsfortherelativelyyoungageofthemajorityofMartianmeteoritesdiscoveredon
Informationonbehavioraldeficitsinratsisalso______tohumans,butthereisanenormousstepbetweenthepsychologyofthet
ThispassageisadaptedfromTheAmericanRepublic:Constitution,Tendencies,andDestinybyO.A.Brownson,1866.Thean
TheNewZealandStormPetrelwasabirdlongthought(i)______,butin2003severalbirdswerespottedforthefirsttimein150
Inarecentstudy,DavidCressyexaminestwocentralquestionsconcerningEnglishimmigrationtoNewEnglandinthe1630s:what
Thispassageisadaptedfrommaterialpublishedin2001.FrederickDouglasswasunquestionablythemostfamousAfricanAmerican
MaxwellPerkinsisconsideredaparticularly(i)______editorbecausehewasamongthefirstto(ii)______theextraordinaryliter
Theauthorusedarhetoricalquestionasaterminalflourishto______thesectionoftext.
Thenewspapers’editorialsectionregularlypublishesthe(i)______ofthosereaderswhoareknowledgeableenoughaboutanissue
随机试题
关于体温,下列叙述中正确的是
用下列哪些方法可测定蛋白质分子量
慢性支气管炎最常见的并发症是
男,44岁。4年来劳累后气促,曾诊为哮喘,x线片示前上纵隔类圆阴影压迫气管,最可能的诊断
《建设工程安全生产管理条例》第30条规定,施工单位因建设工程施工可能造成损害的毗邻建筑物、构筑物和地下管线等,应当采取( )措施。
以下投资工具中,不属于固定收益投资工具的是( )。
对于新员工的培训需求分析,通常使用()来确定其在工作中需要的各种技能。
甲与乙订立货物买卖合同,约定甲于1月8日交货,乙在交货期后的一周内付款。交货期届满时,甲发现乙有转移资产以逃避债务的行为。对此甲可依法行使()。
中国共产党同各民主党派合作的政治基础是
对于我国电子商务发展现状,下列选项不正确的是()。
最新回复
(
0
)